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

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

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

    tmp = res%(10**12)
    if res >= 10**12:
        print(str(tmp).zfill(12))
    else:
        print(tmp)


if __name__ == "__main__":
    main()