MOD = 998244353

N = int(input())
if N == 1:
    print(0)
else:
    inv_N = pow(N, MOD-2, MOD)
    sum_val = 1  # Starts with term m=0
    current = 1
    for m in range(N-2):
        numerator = ( (N - m) % MOD ) * ( ( (N - 2) - m ) % MOD )
        numerator %= MOD
        denominator = (m + 1) % MOD
        inv_denominator = pow(denominator, MOD-2, MOD)
        factor = numerator * inv_N % MOD
        factor = factor * inv_denominator % MOD
        current = current * factor % MOD
        sum_val = (sum_val + current) % MOD
    print(sum_val)