n = int(input())
mod = 10**12
ans = 1
if n < 50:
    for i in range(1,n+1):
        ans *= i
        
    if len(str(ans)) >= 12 and len(str(ans%mod)) < 12:
        print("0"*(12-len(str(ans%mod)))+str(ans%mod))
    else:
        print(ans%mod)
else:
    print("0"*12)