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

int main()
{
    ios::sync_with_stdio(false);
    cin.tie(nullptr);
    int n;
    cin >> n;

    vector<int> fib = {0,1,1};
    for (int i = 1; ; i++){
        if (i >= fib.size()){
            int f = fib.back() + fib[fib.size()-2];
            f %= n;
            fib.push_back(f);
        }

        if (fib[i]%n) continue;
        int ans = 1;
        for (int j = 2; j <= i; j++){
            if (i%j == 0){
                ans = j;
            }
        }
        cout << ans << endl;
        break;

    }

    

    return 0;
}