#include <bits/stdc++.h>
using namespace std;

int main() {
    ios_base::sync_with_stdio(false);
    cin.tie(nullptr);

    int N; cin >> N;
    if(N == 1){cout << 1 << endl; return 0;}
    int a1 = 1,a2 = 1;
    for(int i=3; ; i++){
        int now = (a1+a2)%N;
        if(now == 0){cout << i << endl; return 0;}
        a1 = a2,a2 = now;
    }
}