#include <iostream>
#include <atcoder/modint>
using namespace std;
using ll = long long;
using mint = atcoder::modint998244353;

int N;
int main(void){
    ios::sync_with_stdio(false);
    cin.tie(nullptr);
    
    cin >> N;
    mint a = 0, b = 1;
    for(int i = 0;i < N;i++){
        mint c = a + b;
        a = b;
        b = c;
    }
    cout << a.val() << endl;
    return 0;
}