#include<bits/stdc++.h>
using namespace std;
#define int long long
const int N = 998244353;
signed main()
{
    int n;
    cin>>n;
    vector<int>v(n+1);
    v[1] = 1;
    for(int i = 2;i<=n;++i)
    { 
        v[i] = (v[i-1]+v[i-2])%N;

    }
    cout<<v[n]<<'\n';
}