int main (
{
int x, n, loog = 0;
    scanf_s("%d %d", &x, &n);
    for (int i = 0; i < n; n++) {
        if ((x != 6) && (x != 7)) {
            loog = loog + 250;
            x +=1;
        }
        else if (x == 7) {
            x = 1;
        }
        else {
            x += 1;
        }
    }

    printf("%d", loog);
                          
  return 0;
}