入力1個数え上げ

MOD = 998244353

fact = [1]

N = int(input())

for n in range(1,N+1):

    fact.append(fact[-1]*n%MOD)

if N%2==0:

    print(fact[N//2]**2%MOD)

else:

    print(N*fact[N//2]**2%MOD)