#include<iostream> 
#include<cstdio>
using namespace std;

int main()
{
	long long x,n,t,d;
	cin>>x>>n;
	d=n-(7-x);
	if(x==6||x==7)
		t=d/7*5*250+d%7*250; 
	t=d/7*5*250+d%7*250+(7-2-x)*250;  
	cout<<t;             

	
	return 0;
}