n=int(input())

if n>100:
    print("000000000000")
    exit()

def fact(n,mod=10**12):
    powlist=[0]*(n+1)
    powlist[0]=1
    powlist[1]=1
    for i in range(2,n+1):
        powlist[i]=powlist[i-1]*i%(mod)
    return powlist[-1]

ans = fact(n)
if ans==0:
    print("000000000000")
else:
    print(ans)