#include <iostream>
#include <vector>
#include <utility>
#include <set>
#include <list>
#include <cassert>
#include <queue>
#include <cmath>
#include <algorithm>

using namespace std;
using ll = long long int;
#define REP(i, n) for(int i = 0; i < (int)(n); i++)
#define YES(n) std::cout << ((n) ? "YES" : "NO"  ) << "\n";
#define Yes(n) std::cout << ((n) ? "Yes" : "No" ) << "\n";

#define ALL_INCLUDED_ENVIRONMENT

template <class T, class Alloc, template <class, class> class C> std::ostream& operator<<(std::ostream& o, const C<T, Alloc>& v) {
  o << "{";
  bool init = 1;
  for (auto e : v) {
    if (init) { init = 0; }
    else { o << ", "; }
    o << e;
  }
  o << "}";
  return o;
}

template <class T> vector<T> enum_divisors(T x) {
  x = std::abs(x);
  long long sqrt = std::floor(std::sqrt(x));
  vector<T> res;
  for (T i = 1; i <= sqrt; i++) {
    if (x % i == 0) {
      res.push_back(i);
      if (i * i != x) {
        res.push_back(x/i);
      }
    }
  }
  return res;
}

int main() {
  // cin.tie(0);
  // ios::sync_with_stdio(false);
  ll n, k;
  cin >> n >> k;
  vector<ll> divs = enum_divisors(n);
  sort(divs.begin(), divs.end(), std::greater<ll>());
  for (auto d : divs) {
    if (2*d <= n) {
      cout << d << "\n";
      break;
    }
  }
  return 0;
}