URI - Problem 1007 - Difference

#include<iostream>

using namespace std;

int main()
{
    int a, b, c, d, diff;
    cin >> a;
    cin >> b;
    cin >> c;
    cin >> d;

    diff = a*b - c*d;

    cout << "DIFERENCA = " << diff << endl;

    return 0;
}