diff --git a/123.cpp b/123.cpp
new file mode 100644
index 0000000..d8f13ef
--- /dev/null
+++ b/123.cpp
@@ -0,0 +1,392 @@
+//
+//#include <iostream>
+//#include <time.h>
+//#define N 5
+//const int m = 7;
+//using namespace std;
+//
+///*
+//type_or_void name_func(void_or_ type name1, type name2,..., type1 nameN=value){
+////body
+//return value;
+//}
+//
+//*/
+//
+//double suma(int n = 7) {
+//    double x;
+//    double suma = 0;
+//    for (; n > 0; --n) {
+//        cout << "Input number: ";
+//        cin >> x;
+//        suma += x;
+//    }
+//    return suma;
+//}
+//
+//
+//double sumRec(int n, double arr[]) {//sum(n)=x+sum(n-1)
+//    if (n == 0) return 0;
+//    // double x;
+//    cout << "Input number: ";
+//    cin >> arr[n - 1];
+//    return arr[n - 1] + sumRec(n - 1, arr);
+//}
+//
+//double sumRecNew(int n, double arr[], double s = 0, int i = 0) {
+//    if (i == n) return s;
+//    // double x;
+//    cout << "Input number: ";
+//    cin >> arr[i];
+//    return sumRecNew(n, arr, s + arr[i], i + 1);
+//}
+//
+//
+//
+//
+//
+//double suma(double a[], int n) {
+//    double sum = 0;
+//    for (int i = n - 1; i >= 0; --i)
+//        sum += a[i];
+//    return sum;
+//}
+//
+//
+//void updateElement(double a[], int n) {
+//    for (int i = n / 2; i < n; ++i) {
+//        a[i] += a[0];
+//    }
+//}
+//
+//void showArray(double a[], int n) {
+//    if (n < 2) return;
+//    for (int i = 0; i < n; ++i) {
+//        cout.width(4);
+//        cout << a[i];
+//    }
+//    cout << endl;
+//    return;
+//}
+//
+//void showArray(int a[][m], int n) {
+//
+//    for (int i = 0; i < n; ++i) {
+//        for (int j = 0; j < m; ++j) {
+//            cout.width(4);
+//            cout << a[i][j];
+//        }
+//        cout << endl;
+//    }
+//
+//}
+//
+//void updateArray(int a[][m], int index) {
+//    for (int i = 0; i < m; ++i) {
+//        a[index][i] *= -1;
+//    }
+//}
+//
+//
+//
+//int main()
+//{
+//    srand(time(NULL));
+//    const int n = 5;
+//    double a[5]{ 0 };
+//    /*  cout << "Input n: ";
+//      cin >> n;*/
+//    double s = sumRec(n, a);
+//    cout << "\nArray1:\n";
+//    showArray(a, n);
+//    cout << "S= " << s << endl;
+//
+//    s = sumRecNew(n, a);
+//    cout << "\nArray1:\n";
+//    showArray(a, n);
+//    cout << "S= " << s << endl;
+//
+//
+//
+//
+//    //const int n = 10;
+//    //double sum;// = suma(10);
+//    //cout << "sum(10) = \n" << sum
+//    //    << "\nsum(7) = " << suma();
+//    //cout << "\n n(n>0)= ";
+//   // int n;
+//    //cin >> n;
+//    //if (n <= 0) {
+//    //    cerr << "Error: " << n << " < 0 !!!!\n n= "<<-n<<endl;
+//    //    n = -n;
+//    //}
+//    //sum = suma(n);
+//    //cout << "\nsum(" << n << ") = " << sum << endl;
+//
+//   // double arr[n] = { -4,6,3,7,89,2,3,5,6 };
+//   // cout << "\n Array:\n";
+//   // showArray(arr, n);
+//   // sum = suma(arr,n);
+//   // cout << "\nArray sum(" << n << ") = " << sum << endl;
+//   // cout << "\n Array:\n";
+//   // showArray(arr, n/2);
+//   // sum = suma(arr, n/2);
+//   // cout << "\nArray sum(" << n/2 << ") = " << sum << endl;
+//
+//   // cout << "\n Array:\n";
+//   // showArray(arr+2, n / 2);
+//   //sum = suma(arr+2, n / 2);
+//   // cout << "\nArray sum(" << n / 2 << ") = " << sum << endl;
+//
+//   // cout << "\n Array:\n";
+//   // showArray(arr, n);
+//   // updateElement(arr, n);
+//   // cout << "\n New Array:\n";
+//   // showArray(arr, n);
+//
+// /*   int arr[N][m]{ 0 };
+//    for (int i = 0; i < N; ++i)
+//        for (int j = 0; j < m; ++j)
+//            arr[i][j] = rand() % 100;
+//    cout << "\n Array:\n";
+//    showArray(arr, N);
+//    int index;
+//    cout << "0<= index < " << N - 1 << " ? ";
+//    cin >> index;
+//    if (index < 0 || index >= N) {
+//        index = N / 2;
+//    }
+//    updateArray(arr, index);
+//    cout << "\n  new Array:\n";
+//    showArray(arr, N);*/
+//    system("pause");
+//}
+//
+//
+//
+//
+//
+//#include <iostream>
+//using namespace std;
+//
+//void print(int n) {
+//    if (n == 0) {
+//        return;
+//    }
+//    cout << "*";
+//    print(n - 1);
+//}
+//
+//int main() {
+//    setlocale(0, "");
+//    int n;
+//    cout << "Введiть кiлькiсть зiрок: ";
+//    cin >> n;
+//
+//    print(n);
+//    cout << endl;
+//
+//    system("pause");
+//}
+
+
+//#include <iostream>
+//using namespace std;
+//
+//int sum(int a, int b) {
+//    if (a > b) { 
+//        return 0;
+//    }
+//    return a + sum(a + 1, b);
+//}
+//
+//int main() {
+//    setlocale(0, "");
+//    int a;
+//    int b;
+//    cout << "Введiть a: ";
+//    cin >> a;
+//    cout << "Введiть b: ";
+//    cin >> b;
+//
+//    cout << "Сума чисел вiд " << a << " до " << b << " = " << sum(a, b) << endl;
+//
+//    return 0;
+//}
+
+//#include <iostream>
+//#include <time.h>
+//#define N 5
+//#define B 5
+//using namespace std;
+//
+//int maxElem(int x, int y) {
+//	int max = (x > y) ? x : y;
+//	return max;
+//}
+//
+//int maxElem(int x, int y, int z) {
+//	int max = (x > y) ? x : y;  
+//	max = (max > z) ? max : z;  
+//	return max;
+//}
+//
+//int maxElem(int a[], int n) {
+//	int max = a[0];
+//	for (int i = 1; i < n; i++) {
+//		if (a[i] > max) {
+//			max = a[i];  
+//		}
+//	}
+//	return max;
+//}
+//
+//int maxElem(int a[][N], int n) {
+//	int max = a[0][0];
+//	for (int i = 0; i < n; i++) {
+//		for (int j = 0; j < N; j++) {
+//			if (a[i][j] > max) {
+//				max = a[i][j];
+//			}
+//		}
+//	}
+//	return max;
+//}
+//
+//int maxElem(int a[][N][B], int n) {
+//	int max = a[0][0][0];
+//	for (int i = 0; i < n; i++) {
+//		for (int j = 0; j < N; j++) {
+//			for (int k = 0; k < B; k++) {
+//				if (a[i][j][k] > max) {
+//					max = a[i][j][k];
+//				}
+//			}
+//		}
+//	}
+//	return max;
+//}
+//
+//int main() {
+//    srand(time(0));
+//    setlocale(0, "");
+//
+//    int x = rand() % 100;
+//    int y = rand() % 100;
+//    int z = rand() % 100;
+//    cout << "Случайные числа: x = " << x << ", y = " << y << ", z = " << z << endl;
+//    cout << "max(2): " << maxElem(x, y) << endl;
+//    cout << "max(3): " << maxElem(x, y, z) << endl << endl;
+//
+//    int arr1[5];
+//    cout << "Одномерный массив: ";
+//    for (int i = 0; i < 5; i++) {
+//        arr1[i] = rand() % 100;
+//        cout << arr1[i] << " ";
+//    }
+//    cout << "\nmax(1D): " << maxElem(arr1, 5) << endl << endl;
+//
+//    int arr2[2][N];
+//    cout << "Двумерный массив:\n";
+//    for (int i = 0; i < 2; i++) {
+//        for (int j = 0; j < N; j++) {
+//            arr2[i][j] = rand() % 100;
+//            cout << arr2[i][j] << "\t";
+//        }
+//        cout << endl;
+//    }
+//    cout << "max(2D): " << maxElem(arr2, 2) << endl << endl;
+//
+//    int arr3[2][N][B];
+//    cout << "Трехмерный массив:\n";
+//    for (int i = 0; i < 2; i++) {
+//        cout << "Плоскость " << i << ":\n";
+//        for (int j = 0; j < N; j++) {
+//            for (int k = 0; k < B; k++) {
+//                arr3[i][j][k] = rand() % 100;
+//                cout << arr3[i][j][k] << "\t";
+//            }
+//            cout << endl;
+//        }
+//        cout << endl;
+//    }
+//    cout << "max(3D): " << maxElem(arr3, 2) << endl;
+//
+//    return 0;
+//}
+
+
+#include <iostream>
+#include <ctime>
+using namespace std;
+
+void bSort(int arr[], int size) {
+    for (int i = 0; i < size - 1; ++i) {
+        for (int j = 0; j < size - i - 1; ++j) {
+            if (arr[j] > arr[j + 1]) {
+                int temp = arr[j];
+                arr[j] = arr[j + 1];
+                arr[j + 1] = temp;
+            }
+        }
+    }
+}
+
+int bSearch(int arr[], int size, int target) {
+    int low = 0;
+    int high = size - 1;
+
+    while (low <= high) {
+        int m = low + (high - low) / 2;
+
+        if (arr[m] == target) {
+            return m;
+        }
+        if (arr[m] < target) {
+            low = m + 1;
+        }
+        else {
+            high = m - 1;
+        }
+    }
+
+    return -1;
+}
+
+int main() {
+    srand(time(0));
+    setlocale(0, "");
+
+    const int size = 10;
+    int arr[size];
+
+    cout << "Початковий масив: ";
+    for (int i = 0; i < size; ++i) {
+        arr[i] = rand() % 300 + 1;
+        cout << arr[i] << " ";
+    }
+    cout << endl;
+
+    bSort(arr, size);
+
+    cout << "Вiдсортований масив: ";
+    for (int i = 0; i < size; ++i) {
+        cout << arr[i] << " ";
+    }
+    cout << endl;
+
+    int t;
+    cout << "Введiть елемент для пошуку: ";
+    cin >> t;
+
+    int index = bSearch(arr, size, t);
+
+    if (index != -1) {
+        cout << "Елемент знайдено на iндексi (у вiдсортованому масивi): " << index << endl;
+    }
+    else {
+        cout << "Елемент не знайдено." << endl;
+    }
+
+    return 0;
+}