#include <bits/stdc++.h>
#define MOD 998244353ll
using namespace std;
using ll = long long;


int main(){
    ll n;   cin >> n;

    vector<ll> fib(n + 1);
    fib[1] = fib[2] = 1;
    for(int i = 3; i < n + 1; ++i){
        fib[i] = (fib[i - 1] + fib[i - 2]) % MOD;
    }
    cout << fib[n] << endl;

    return 0;
}