#include <bits/stdc++.h>
using namespace std;

int main() {
	int a, b, cnt = 0;
	cin >> a >> b;
	cnt = b / 7;
	cnt = (b - cnt * 2) * 250;
	if (a == 6 && b / 7 == 0) {
		cnt -= 250 * 2;
		if (a == 1) {
			cnt += 250;
		}
	} else if (a == 7) {
		cnt -= 250;
	}
	cout << cnt;
	return 0;
}