#include <bits/stdc++.h>

using namespace std;
#define rep(i,n) for(int i=0;i<n;++i)
#define rep1(i,n) for(int i=1;i<=n;++i)
#define rrep(i,n) for(int i=n-1;i>=0;--i)
#define debug(output) if(debugFlag)cout<<#output<<"= "<<output<<"\n";
using lint = long long;
typedef pair<int,int> P;
const bool debugFlag=true;
const lint linf=1.1e18;const int inf=1.01e9;
constexpr int MOD=1000000007;
template<class T>bool chmax(T &a, const T &b) { if(a < b){ a = b; return 1; } return 0; }
template<class T>bool chmin(T &a, const T &b) { if(a > b){ a = b; return 1; } return 0; }

#include<atcoder/all>
using namespace atcoder;
using mint = modint998244353;

signed main(){
    int n;cin>>n;
    vector<array<mint,3>> dp(n,{0,0,0});
    dp[0][0]=1;
    rep(_z,n){
        vector<array<mint,3>> ndp(n,{0,0,0});
        rep(i,n){
            rep(j,3){
                int x=i+(j+1)/3;
                int y=(j+1)%3;
                ndp[i][j]+=dp[i][j]*25;
                ndp[x][y]+=dp[i][j];
            }
        }
        swap(dp,ndp);
    }
    mint res=0;
    rep(i,n)rep(j,3){
        res+=i*dp[i][j];
    }
    cout<<res.val()<<"\n";
    return 0;
}