N = int(input())
mod = 998244353

pow2 = [1] * (N + 1)
for i in range(1, N + 1):
    pow2[i] = pow2[i - 1] * 2 % mod
fact = [1] * (N + 1)
for i in range(1, N + 1):
    fact[i] = i * fact[i - 1] % mod
fact_inv = [1] * (N + 1)
fact_inv[N] = pow(fact[N], mod - 2, mod)
for i in range(1, N + 1)[::-1]:
    fact_inv[i - 1] = i * fact_inv[i] % mod
comb = lambda n, k: fact[n] * fact_inv[k] * fact_inv[n - k] % mod

ans = 0
for k in range(0, N + 1, 2):
    ans = (ans + 2 * comb(N, k) * pow2[abs(N - 2 * k)]) % mod
print(ans)