#include<bits/stdc++.h>
using namespace std;
int main(){
    long long x,n,r = 0,i;
    cin>>x>>n;
    for(i = x;i <= x + n - 1;i++){
        if(i % 7 != 6 && i % 7 != 0){
            r = r + 250;
        }
    }
    cout<<r<<endl;
}
/**************************************************************
	Problem: 1468
	User: linmiaoling
	Language: C++
	Result: Accepted
	Time:16 ms
	Memory:2072 kb
****************************************************************/