from bisect import bisect_left


def main():
    a, b = map(int, input().split())

    lst = [i * 12 * 3600 // 11 for i in range(12)]
    cur = (a % 12) * 3600 + b * 60
    ans = lst[bisect_left(lst, cur)] - cur
    print(ans)


if __name__ == "__main__":
    main()