#include<iostream>
using namespace std;
int main()
{
	int x, n,sum,a;
	cin >> x >> n;          
	if (x == 1)
	{
		a = n / 7;
		sum = (n - a * 2) * 250;
	}
	else
	{
		int m = n;
		n = n - (7 - x + 1);
		if (x == 7)
		{
			a = n / 7;
			sum = (m - 1 - a * 2) * 250;
		}
		if(x!=7)
		{
			a = n / 7 + 1;
			sum = (m - a * 2) * 250;
		}
	}
	cout << sum;
	return 0;
}