#include <bits/stdc++.h>

using namespace std;

int main() {
    int n = 112 / 14;
    for (int i = 0; i <= n; ++i) {
        if (i * 12 + (n - i) * 20 == 112) {
            cout << i << endl;
            break;
        }
    }
    return 0;
}