#include"iostream"
#include"cmath"
using namespace std;
int main()
{
	int x, n;
	cin >> x >> n;
	int sum = 0;
	int ans = -1;
	for (int i = x; i <= 7; i++)
	{
		if (i != 6 &&i != 7)
		{
			sum = sum + 250;
		}
		ans++;
	}
	n = n - ans;
	if (n % 7 == 0)
	{
		sum = sum + (n / 7) * 1250;
	}
	else 
	{
		sum = sum + (n / 7) * 1250 + min((n % 7) * 250,1250);
	}
	cout << sum;
	return 0;
}