#include <iostream>

using namespace std;

int main() {
    int a, b, i, sum = 0;
    cin >> a >> b;
    for (i = a; i <= a + b - 1; ++i) {
        if (i % 7 == 6 || i % 7 == 0) {
            continue;
        }
        sum += 250;
    }
    cout << sum << endl;
    return 0;
}