#include<bits/stdc++.h>
using namespace std;
using ll=long long;
using pii=pair<int,int>;

#define all(a) a.begin(),a.end()
#define pb push_back
#define sz(a) ((int)a.size())

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

void amano_hina_is_the_goat(){
    int n; cin >> n;
    vector<mint> vec={1,1,1},res={1};
    for(int i=n; i; i>>=1,vec=convolution(vec,vec)) if(i&1) res=convolution(res,vec);
    mint ans=(res[n]-1)/2;
    cout << ans.val() << "\n";
}

signed main(){
    ios_base::sync_with_stdio(0),cin.tie(0);
    cout << fixed << setprecision(20);
    int t=1; //cin >> t;
    while(t--) amano_hina_is_the_goat();
}