#include <iostream>

using namespace std;

int min(int **mas, int rows, int cols);

int main()
{
    int rowsA = 4, colsA = 4, rowsB = 5, colsB = 5, rowsC = 3, colsC = 3;
    int **A = new int* [rowsA];
    int **B = new int* [rowsB];
    int **C = new int* [rowsC];
    for (int i = 0; i < rowsA; i++) {
        A[i] = new int [colsA];
    }
    for (int i = 0; i < rowsB; i++) {
        B[i] = new int [colsB];
    }
    for (int i = 0; i < rowsC; i++) {
        C[i] = new int [colsC];
    }
    for(int i = 0; i < rowsA; i++) {
        for(int j = 0; j < colsA; j++) {
            cout << "Enter next element of matrix A ";
            cin >> A[i][j];
        }
    }
    for(int i = 0; i < rowsB; i++) {
        for(int j = 0; j < colsB; j++) {
            cout << "Enter next element of matrix B ";
            cin >> B[i][j];
        }
    }
    for(int i = 0; i < rowsC; i++) {
        for(int j = 0; j < colsC; j++) {
            cout << "Enter next element of matrix C ";
            cin >> C[i][j];
        }
    }
    int minA = min(A, rowsA, colsA);
    int minB = min(B, rowsB, colsB);
    int minC = min(C, rowsC, colsC);
    cout << "A min * B min - C min = " << minA * minB - minC << endl;
    for (int i = 0; i < rowsA; i++) {
        delete[] A[i];
    }
    for (int i = 0; i < rowsB; i++) {
        delete[] B[i];
    }
    for (int i = 0; i < rowsC; i++) {
        delete[] C[i];
    }
}

int min(int **mas, int rows, int cols)
{
    int minValue = mas[0][0];
    for(int i = 0; i < rows; i++) {
        if(mas[i][i] < minValue)
            minValue = mas[i][i];
    }
    return minValue;
}