MOD = 998244353
N = 200000
fact = [0 for _ in range(N)]
invfact = [0 for _ in range(N)]
fact[0] = 1
for i in range(1, N):
    fact[i] = fact[i - 1] * i % MOD

invfact[N - 1] = pow(fact[N - 1], MOD - 2, MOD)

for i in range(N - 2, -1, -1):
    invfact[i] = invfact[i + 1] * (i + 1) % MOD

def nCk(n, k):
    if k < 0 or n < k:
        return 0
    else:
        return (fact[n] * invfact[k] % MOD) * invfact[n - k] % MOD

def nPk(n, k):
    if k < 0 or n < k:
        return 0
    else:
        return fact[n] * invfact[n - k] % MOD

def nHk(n, k):
    if n == k == 0:
        return 1
    return nCk(n + k - 1, k)

n = int(input())
ans = 0
times = n * fact[n - 2] % MOD
for i in range(2, n - 1):
    d = n - i
    inv = invfact[i - 2] * invfact[d - 2] % MOD
    inv *= pow(i, MOD - 2, MOD) * pow(d, MOD - 2, MOD) % MOD
    inv %= MOD
    tmp = inv * times % MOD
    ans += tmp * tmp % MOD
    ans %= MOD
print(ans)