include <bits/stdc++.h>

using namespace std;

int main() {

int a, b, c, z = 0, o, n, m;
cin >> a >> b >> c;
o = a * 2 / 10;
n = b * 3 / 10;
m = c * 5 / 10;
z = o + m + n;
cout << z;
return 0;

}