#include <bits/stdc++.h>
using namespace std;
using ll = long long;
#define rep(i, n) for (int i = 0; i < (int)(n); i++)

void solve() {
  ll n;
  cin >> n;
  ll now = 0, b = 9;
  for (ll ans = 1;; ans++) {
    now += b;
    now %= n;
    b *= 10;
    b %= n;
    if (now == 0) {
      cout << ans << '\n';
      return;
    }
  }
}

int main() {
  std::cin.tie(nullptr);
  std::ios_base::sync_with_stdio(false);
  int T = 1;
  for (int t = 0; t < T; t++) {
    solve();
  }
  return 0;
}