#include<iostream>
using namespace std;
int main()
{
	int l [7] = {1,2,3,4,5,6,7};
	int today = 0;
	int day = 0;
	int a = 0;
	cin >> today >> day;
	while (day--)
	{
		if (l[today] != 6 && l[today] != 7)
		{
			a++;
		}
		if (l[today] == 7)
		{
			today = 0;
		}
		today++;
	}
	cout << a * 250 << endl;
}