#include <iostream>
using namespace std;

int main() {
	int x, n, sum;
	cin >> x >> n;
	for (int i = 0; i < n; i++, x++) {
		if ((x % 7) == 6 || (x % 7) == 0) {
			continue;
		} else {
			sum += 250;
		}

	}
	cout << sum;
	return 0;
}