using namespace std;
const int N = 33;
int q[N];
int main()
{   
    bool flag = false;
    int x,n,sum = 0;
    cin >> x >> n;
    while (n)
    {

        if ((x % 7) >= 1 && x % 7 < 6 && x % 7 != 0)
        {
            sum += 250;
        }
        x++;
        n--;
    }
    cout << sum;
}