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

using ll = long long;

const ll MOD = 998244353;
const string T = "mole";

int main() {
    int N;
    cin >> N;

    int L = T.size();
    vector<ll> dp(L + 1, 0);
    dp[0] = 1;

    for (int i = 0; i < N; i++) {
        vector<ll> ndp(L + 1, 0);

        for (int j = 0; j <= L; j++) {
            ndp[j] = 26 * dp[j] % MOD;
        }

        for (int j = 0; j < L; j++) {
            ndp[j + 1] = (ndp[j + 1] + dp[j]) % MOD;
        }

        dp = ndp;
    }

    cout << dp[L] << '\n';
    return 0;
}