def factorial(n):
    if n == 1:
        return 1
    else:
        return n * factorial(n-1)
        
N = int(input())
Nf = factorial(N)
if Nf >= 10**12:
    Nf_l = list(str(Nf))
    s = ""
    for i in range(-12,-1):
        s += Nf_l[i]
    print(int(s))
elif Nf < 10**12:
    print(Nf)