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

using ll = long long;
using ld = long double;
#define fi first
#define se second
#define pb push_back

int main(){
  int n,k;
  cin>>n>>k;
  int p[n];
  for(int i=0;i<n;i++){
    cin>>p[i];
  }
  
  int ans=0;
  
  for(int border=0;border<500;border++){
    int x=0;
    for(int i=0;i<n;i++){
      if(p[i]>=border){
        x++;
      }
    }
    if(x<=k){
      ans=max(ans,x);
    }
  }
  
  cout<<ans<<endl;
}