#include <iostream>
#include <algorithm>
#include <string>
using namespace std;

int main() {
	int l, m, n, c_1, c_2, c_3, ans;
	cin >> l;
	cin >> m;
	cin >> n;
	
	c_1 = n/25;
	c_2 =(m + c_1)/4;
	c_3 = (l + c_2)/10;
	ans = c_1 + c_2 + c_3;
	cout << ans << endl;
	
	return 0;
}