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

#define rep(i, n) for (int i = 0; i < (int)n; i++)
using ll = long long int;

int main() {
  int n;
  cin >> n;
  int m = 9 % n;
  int k = 1;
  while (m != 0) {
    m = (m * 10 + 9 % n) % n;
    k++;
  }
  cout << k << endl;
  return 0;
}