#include <bits/stdc++.h>
#define int long long
#define chmax(x, y) x = max(x, y)
#define chmin(x, y) x = min(x, y)
#define SP << " " <<
#define fish signed
using namespace std;
mt19937 rnd(1209);
const int INF = 0x3f3f3f3f3f3f3f3f, mod = 998244353;
int qpow(int a, int b)
{
    if(b < 0) return 1;
    int res = 1;
    while(b)
    {
        if(b & 1) res = res * a % mod;
        a = a * a % mod, b >>= 1;
    } return res;
}
fish main()
{
    // freopen(".in", "r", stdin);
    // freopen(".out", "w", stdout);
    ios::sync_with_stdio(0);
    cin.tie(0); cout.tie(0);
    int n; cin >> n;
    if(n & 1) return cout << "0\n", 0;
    int ans = 1;
    for(int i = 1; i <= n / 2; i ++) ans = ans * (i * 2 - 1) % mod;
    ans = ans * qpow(n / 2, n / 2 - 2) % mod;
    ans = ans * qpow(4, n / 2 - 1) % mod; cout << ans << "\n";
    return 0;
}