#include <bits/stdc++.h>

using namespace std;
void fast_io() {
    ios::sync_with_stdio(false);
    std::cin.tie(nullptr);
}
int main() {
    fast_io();
    int n;
    cin >> n;
    int p1 = 1, p2 = 1;
    if (n == 1) {
        cout << 1 << endl;
        return 0;
    }
    for (int i = 3;; i++) {
        int nex = (p1 + p2) % n;
        if (nex == 0) {
            cout << i << endl;
            return 0;
        }
        p1 = p2;
        p2 = nex;
    }
}