#include<bits/stdc++.h>
using namespace std;
#define rep(i,n) for (long long i=0;i<(long long)(n);i++)
#define all(v) v.begin(),v.end()
using ll=int;
using pll=pair<ll,ll>;
using tll=tuple<ll,ll,ll>;
template<class T> void chmin(T &a,T b){
    if(a>b){
        a=b;
    }
}
template<class T> void chmax(T &a,T b){
    if(a<b){
        a=b;
    }
}
ll dp[3010][26][3010];
int main(){
    const ll mod=998244353;
    ll n;
    cin >> n;
    
    dp[0][0][0]=1;
    rep(i,n){
        rep(j,26){
            rep(k,i+1){
                if(dp[i][j][k]==0) continue;
                //cout << ('o'-'a') << " " << ('n'-'a') << endl;
                
                rep(l,26){
                    if(k%3==0&&l==('c'-'a')){
                        dp[i+1][l][k+1]+=dp[i][j][k];
                        dp[i+1][l][k+1]%=mod;
                    }else if(k%3==1&&l==('o'-'a')){
                        dp[i+1][l][k+1]+=dp[i][j][k];
                        dp[i+1][l][k+1]%=mod;
                    }else if(k%3==2&&l==('n'-'a')){
                        dp[i+1][l][k+1]+=dp[i][j][k];
                        dp[i+1][l][k+1]%=mod;
                    }else{
                        dp[i+1][l][k]+=dp[i][j][k];
                        dp[i+1][l][k]%=mod;
                    }
                }
            }
        }
    }
    ll ans=0;
    rep(j,26){
        rep(k,n+1){
            ans+=k/3%mod*dp[n][j][k]%mod;
            ans%=mod;
        }
    }
    cout << ans << endl;
}