XAYNHA.cpp

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

int n, k;
int a[10005];

int tinh(int mid) {
  int tong = 0;
  for (int i = 1; i <= n; i++) {
    tong = tong + a[i] / mid;
  }
  return tong;
}

int main() {
  cin >> n >> k;
  for (int i = 1; i <= n; i++) {
    cin >> a[i];
  }
  double left = 0, right = 1000000000, result = -1;
  while (left <= right) {
    int mid = (left + right) / 2;
    if (tinh(mid) >= k) {
      result = mid;
      left = mid + 1;
    }
    else {
      right = mid - 1;
    }
  }
  cout << setprecision(3) << fixed << result << '\n';
}