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

int main() {
    ios::sync_with_stdio(false);
    cin.tie(nullptr);
    
    int n;
    cin >> n;
    int r = 0;
    int cnt = 0;
    while (true) {
        r = (r * 10 + 1) % n;
        ++cnt;
        if (r == 0) {
            cout << cnt;
            break;
        }
    }
    return 0;
}