#include<bits/stdc++.h>
using namespace std;
int main(){
	int x,n,g,b = 7,m = 2,c,d,e;
	cin>>x>>n;
	g = b - x;
	if (g == 1 && g == 0){
		n = n - g;
	}else{
		x = b - 2 - x + 1;
	}
	if (n > 7){
		d = n / 7;
		d = d * m;
	} 
	c = (n - d) * 250;
	cout<<c<<endl;
	return 0;
}