N = int(input())
mod = int(1e12)
if N >= 60:
    print("0"*12)
else:
    k = 1
    for i in range(N):
        k *= i + 1
        k %= mod
    if N >= 15:
        print((12-len(str(k)))*'0', end = '')
        print(k)
    else:
        print(k)