#include <bits/stdc++.h>

using namespace std;

int main() {
    int a, b, c;
    cin >> a >> b >> c;
//    printf("%d", int(a * 0.2 + b * 0.3 + c * 0.5 + 0.5));
    printf("%d", ceil(a * 0.2 + b * 0.3 + c * 0.5));
    return 0;
}