#include <iostream>
#include<bits/stdc++.h>
#include<utility>
#include <queue>
#define ll long long
#define ull unsigned long long
#define pi  3.14159

#define OO  2000000000
//#define ceil(w, m) (((w) / (m)) + ((w) % (m) ? 1 : 0))
using namespace std;

void yasmeen_fakhri(){
  ios_base::sync_with_stdio(false); cin.tie(nullptr); cout.tie(nullptr);
  #ifndef ONLINE_JUDGE
    freopen("input.txt", "r", stdin), freopen("output.txt", "w", stdout);
  #endif
}



int main() {
   yasmeen_fakhri();

  int n , k ;   cin>>n>>k;
  int arr[n]; int freq[1005]={0};
  for(int i=1 ; i<=n; i++){
      cin>>arr[i];
      freq[arr[i]]++;

  }
  int arr1[1005]={0};
  int c =1;
  for(int i=1 ; i<=1005 ; i++){
      int m=i ;
      if(freq[m] == 0)  {
      arr1[c] = m ;
      c++;
  }
  }
  cout<<arr1[k];

   return 0;
}