/*                        _
                       _oo0oo_
                      o8888888o
                      88" . "88
                      (| -_- |)
                      0\  =  /0
                   ____/`---'\____
                  /  \\|     |//  \
                 / \\||| /:\ |||// \
                / _||||| -:- |||||- \
               |   | \\\ \-/ /// |   |
               | \_|  ''\---/''  |_/ |
               \  .-\__  '-'  ___/-. /
            ____'. .'  /--.--\  `. .'_____
          /"" '<  `.___\_<|>_/___.' >' "" \
         | | :  `- \`.;`\ _ /`;.`/ - ` : | |
         \  \ `_.   \_ __\ /__ _/   .-` / _/
          `-.____`.___ \_____/___.-`___.-'

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 JENISH MONPARA S.    IIT PATNA    I_LOVE_ADITI_GOEL
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~*/
#include <bits/stdc++.h>
using namespace std;
const long double PI = 3.141592653589793;
const long double DEL = 1e-10;
const int mod =  1000000007;
const int LIM = 100005;

#define fio ios_base::sync_with_stdio(0);cin.tie(0);cout.tie(0)
#define mpq priority_queue<int,vector<int>,greater<int>>
#define deb(a) cerr << #a << ": " << a << endl
#define ftt cin>>t;for(int tt=1;tt<=t;++tt)
#define Rev(v) reverse(v.begin(),v.end())
#define Sort(v) sort(v.begin(),v.end())
#define mem(a,b) memset(a,b,sizeof(a))
#define umii unordered_map<int,int>
#define all(a) a.begin() , a.end()
#define vvi vector<vector<int>>
#define pq priority_queue<int>
#define sqr(a) (((a) * (a)))
#define double long double
#define dbg cout<<"\nhi\n"
#define pii pair<int,int>
#define mii map<int,int>
#define vb vector<bool>
#define vi vector<int>
#define nl cout<<"\n"
#define pb push_back
#define int long long
#define sp <<" "<<
#define ss second
#define ff first
 
int fpow(int x, int n)
{
    int res = 1;
    while(n){
          if(n&1){
                res = res * x % mod;
          }
          x = x * x % mod;
          n>>=1;
    }
    return res;
}
int gcd(int a,int b)
{
    if(b == 0)
    {
          return a;
    }
    return gcd(b,a % b);
}
void sieve(int n)
{
      bool prime[5*LIM];
      memset(prime, true, sizeof(prime));
      int rootn = (int)sqrt(n);
      for (int p = 2; p <= rootn; p++)
      {
            if (prime[p] == true)
            {
                  for (int i = p*p; i <= n; i += p)
                  {
                        prime[i] = false;
                  }
            }
      }
      prime[1] = 0;
}
int cnt, sum, mid, mx, mn, ans, a[2*LIM];
int n, m, d, p, q, t, i, j, k, l, r, x, y, z;
bool f, f1, f2;
string s;

//******************************************* CHECK CONSTRAINTS **************************************************

void process(double l)
{
      for(i=1;i<=n;i++)
      {
            if(a[i] > l)
            {
                  cnt += (int)((a[i] + l - DEL)/l) - 1;
            }
      }
      //cout<<l sp cnt;nl;
}

int32_t main()
{     fio;
      cin>>n>>k;
      for(i=1;i<=n;i++)
      {
            cin>>a[i];
      }
      double l = 0,r = 1e9,mid;
      while(r - l > 1e-6)
      {
            mid = (l+r)/2;
            cnt = 0;
            process(mid);
            if(cnt > k)
            {
                  l = mid + DEL;
            }
            else
            {
                  r = mid;
            }
      }
      cout<<(int)ceil(l);
}


Measured memory_bytes: 5152