#include <bits/stdc++.h>
using namespace std;
#include <atcoder/math>
using namespace atcoder;

#define rep(i, a, b) for (int i = a; i < b; i++)
using ll = long long;

int main(){
    int n;
	cin >> n;
    ll mod = 998244353;
    vector<ll> fac(n + 1), ifac(n + 1);
    fac[0] = 1;
    rep(i, 1, n + 1) fac[i] = fac[i - 1] * i % mod;
    ifac[n] = pow_mod(fac[n], mod - 2, mod);
    for(int i = n; i > 0; i--) ifac[i - 1] = ifac[i] * i % mod;
    int r = n - 4;
    ll ans = fac[n] * ifac[4] % mod * ifac[n - 4] % mod;
    ans = ans * pow_mod(26, r, mod) % mod;
    cout << ans << endl;
}