#include<bits/stdc++.h>
using namespace std;
int main()
{
	int n,x,i,s=0;
	cin>>x>>n;
	for(i=1;i<=n;i++){
		s+=250;
		if(x==6||x==7){
			s-=250;
		}
		if(x+1>7){
			x=0;
		}
		x++;
	}
	cout<<s;
	return 0;
}

/**************************************************************
	Problem: 1468
	User: zzz
	Language: C++
	Result: Accepted
	Time:14 ms
	Memory:2072 kb
****************************************************************/