N = int(input())
mod = 998244353
fac = [0]*(N+1)
inv = [0]*(N+1)
fac[0], inv[0] = 1, 1
for i in range(1, N+1):
    fac[i] = fac[i-1]*i
    fac[i] %= mod
    inv[i] = inv[i-1]*pow(i, mod-2, mod)
    inv[i] %= mod

res = (2*pow(2,N,mod))%mod
for i in range(1,N):
    if i+i<=N:
        res += (2*fac[N-2*i+2*i-1]*inv[N-2*i]*inv[2*i-1]*pow(2,abs(N-4*i),mod))%mod
        res %= mod
    if i+i+1<=N:
        res += (2*fac[N-2*i-1+2*i]*inv[N-2*i-1]*inv[2*i]*pow(2,abs(N-4*i),mod))%mod
        res %= mod
print(res)