#include <bits/stdc++.h> using namespace std; #if __has_include(<atcoder/all>) #include <atcoder/all> using namespace atcoder; #endif template<class T, class... Ts> void print(const T& a, const Ts&... b){cout << a;(cout << ... << (cout << ' ', b));cout << '\n';} template<class... T> void input(T&... a){(cin >> ... >> a);} void print(){cout << '\n';} typedef long long ll; typedef long double ld; typedef pair<ll, ll> P; typedef tuple<ll, ll, ll> T; typedef modint998244353 mint; #define rep(i, n) for(ll i = 0; i < n; i++) int main() { cin.tie(nullptr); ios_base::sync_with_stdio(false); ll n; input(n); vector<vector<mint>> dp(n+1,vector<mint>(n+1,0)); dp[0][0] = 1; rep(i,n){ rep(j,n){ dp[i+1][j] += 25*dp[i][j]; dp[i+1][j+1] += dp[i][j]; } } mint ans = 0; for(int i=0;i<n+1;i++)ans += dp[n][i]*(i/3); print(ans.val()); return 0; }