from functools import reduce

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

    if n > 50:
        # こんなことに気づかないなんて……
        print("000000000000")
        return

    result = reduce(lambda x, y: x * y, range(1, n + 1)) % 1000000000000

    if result > 1000000000000:
        print("{:012}".format(result))
    else:
        print(result)

if __name__ == "__main__":
    main()