#include<iostream>
#include<algorithm>
#include <cmath>
#include<iomanip>
using namespace std;
int main() {
	int n, x, a, b;//游了n天，周x开始游,a为整周数，b为不足一周剩下的天数
	cin >> x >> n;
	a = n % 7;
	b = n / 7;
	if (x <= 5) {
		if (a + x <= 6) {
			cout << b * 5 * 250 + a * 250;
		}
		else if (a + x >= 8) {
			cout << b * 5 * 250 + (a - 2) * 250;
		}
		else {
			cout << b * 5 * 250 + (a - 1) * 250;
		}
	}
	else if (x == 6) {
		if (a >= 2) {
			cout << b * 5 * 250 + (a - 2) * 250;
		}
		else {
			cout << b * 5 * 250;
		}
	}
	else {
		cout << b * 5 * 250 + (a - 1) * 250;
	}
	return 0;
}