n=int(input())

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

def fact(n,mod=10**12):
    now=1
    flag=False
    for i in range(2,n+1):
        now*=i
        if now >= mod:
            flag=True
            now%=mod
    return now,flag

ans,flag = fact(n)
if ans==0:
    print("000000000000")
elif flag:
    print(str(ans).zfill(12))
else:
    print(ans)