def main():
    n = int(input())

    # n = 100000
    if n >= 50:
        print('000000000000')
        return

    res = 1
    # for n in range(1, n+1):
    #     res *= n
    #     if res%(10**12) == 0:
    #         print(n)
    #         break

    for n in range(1, n+1):
        res *= n

    print(res%(10**12))


if __name__ == "__main__":
    main()