e-olymp 9562

#include <bits/stdc++.h>
using namespace std;

int main()
{
    int n , m;
    cin >> n >> m;
    int a[105][105];
    for(int i = 1; i <= n; i++){
        for(int j = 1; j <= m; j++){
            cin >> a[i][j];
        }
    }

    int start_row , start_column , end_row , end_column;
    cin >> start_row >> start_column >> end_row >> end_column;
    int sum = 0;
    for(int i = start_row; i <= end_row; i++){
        for(int j = start_column; j <= end_column; j++){
            sum += a[i][j];
        }
    }
    cout << sum << endl;
}