MOD = 998244353
n = int(input())
if n == 1:
    print(0)
elif n == 2:
    print(2)
else:
    t = 1
    for i in range(1, n + 1):
        t *= i
        t %= MOD
    print((t * n + t * (n + 1) * (n - 4) * pow(6, MOD - 2, MOD)) % MOD)