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#include <bits/stdc++.h>
using namespace std;
int main() {
int n, x;
cin >> x >> n;
int count = 0;
// 6 7 1 2 3 4 5 6 7 1 2 3
for (int i = 1; i <= n; i++) {
if (x == 6 || x == 7) {
x++;
continue;
}
x++;
count++;
}
cout << count * 250 << endl;
return 0;
}