1užd rk

#include <iostream>

using namespace std;

int main()
{
    int a, b;
    cout << "Iveskite a = ";
    cin >> a;
    cout << "Iveskite b = ";
    cin >> b;

    int r1 = (a-b-12)*2;
    int c;
    cin >> c;
    int r2 = (r1-c-13)*2;
    cout << r2;
    return 0;
}