#include<iostream>
using namespace std;
int main()
{
	int x = 0, n = 0, i = 0, sum = 1, k = 0, m = 0;
	cin >> x >> n;
	i = x - 1;
	n = n + i;
	k = n / 7;
	m = n % 7;
	if (m != 6)
	{
		sum = m * 250;
	}
	else { sum = 5 * 250; }
	if (i == 6)
		i = 5;
	sum = k * 5 * 250 + sum - i * 250;
	cout << sum << endl;
	return 0;
}