N = int(input())

if N <= 15:
    res = 1
    for i in range(1, N + 1):
        res *= i
    print(res % 10**12)
elif 16 <= N <= 50:
    res = 1
    for i in range(1, N + 1):
        res *= i
        res %= 10**12
    print(str(res).zfill(12))
else:
    print('0' * 12)