def each_slice_2(f, iterator):
    a = iterator.__iter__()
    for i in a:
        try:
            j = a.__next__()
        except:
            j = 0
        yield f(i, j)

def fanc(n):
    a = range(1, n+1)
    while n > 0:
        a = each_slice_2(lambda x, y: x * y if y != 0 else x, a)
        n //= 2
    return a.__next__()

def main(n):
    MAX = 1000000000000
    res = fanc(n)
    if res > MAX:
        res %= MAX
        print("{:012}".format(res))
        return
    print(res)

if __name__ == "__main__":
    n = int(input())
    main(n)