N = int(input())
mod = 1000000000000
ans = 1
f = False
for i in range(1,N+1):
    ans *= i
    if f==False and ans //mod >= 1:
        f = True
    ans %= mod
    if ans == 0:
        break
l = str(ans)
print('0'*(12-len(l))+str(ans))