СОМЫ

#include <bits/stdc++.h>

using namespace std;

int main(){
    int c3, c10, s;
    cin >> c3 >> c10 >> s;

    for (int i = 0; i <= c3; i++) {
        for (int j = 0; j <= c10; j++) {
            if (i * 3 + j * 10 == s) {
                cout << i + j << endl;
                return 0;
            }
        }
    }

    cout << 0 << endl;
}