#include <iostream>
using namespace std;

int main() {
    int A, B, C;
    cin >> A >> B >> C;

    // 总成绩 = (2*A + 3*B + 5*C) / 10
    int total = (2 * A + 3 * B + 5 * C) / 10;

    cout << total << endl;

    return 0;
}