#include <bits/stdc++.h>
using namespace std;
#include<atcoder/all>
using mint = atcoder::modint998244353;
using ld = long double;
#define fi first
#define se second
#define all(x) x.begin(), x.end()
#define rep(i,n) for(int i=0;i<(int)(n);++i)
#define chmax(a,b) a=max(a,b)
#define chmin(a,b) a=min(a,b)

int main(){
    ios::sync_with_stdio(false);
    cin.tie(nullptr);
    
    int N;
    cin>>N;
    vector dp(N+1,vector<mint>(N+1,0));
    rep(i,N){
        rep(j,i+2){
            if(j>0) dp[i+1][j-1]+=dp[i][j]+j-1;
            if(j<=i) dp[i+1][j+1]+=dp[i][j];
        }
    }
    cout<<dp[N][N].val()<<"\n";
}