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#include<bits/stdc++.h>
using namespace std;
int x, n;
int swim(int a, int b){
    int cnt = 0;
    for(int i = 1 ; i <= b; i++){
        int now = a;
        if(now == 7)now = 1;
        if(now != 6 && now != 7)cnt ++;
    }
    return cnt;
}
int main(){
    cin >> x >> n;
    int ans = swim(x, n) * 250;
    cout << ans << endl;
    return 0;
}