#include<bits/stdc++.h>
using namespace std;
int main(){
	unsigned long long n,a;
	int x;
	cin>>x>>n;
	if(x>=1&&x<=5){
		a=6-x;
		if(n<=a||(n>a&&n<=a+2)){
			cout<<a*250;
		}else if(n>a+2){
			cout<<a*250+((n-a-2)-(n-a-2)/7*2)*250;
		}
	}else{
		a=8-x;
		if(n==1||a==2&&n==2){
			cout<<0;
		}else if(n>=2){
			cout<<((n-a)-(n-a)/7*2)*250;
		}
	}
	return 0;
}