#include<iostream>
using namespace std;
int main(){
    int days[7] = {1,2,3,4,5,6,7};
    int x,n,res,day;
    res = 0;
    cin>>x>>n;
    for (int i = 0; i<n; i++){
        day = (n+i)%7;
        if (day == 0) day = 7;
//        cout<<day<<endl;
        if (days[day - 1] != 6 && days[day - 1] != 7){
            res += 250;
        }
    }
    cout<<res<<endl;
}