#include <stdio.h>
#include <bits/stdc++.h>
using namespace std;
#define rep(i,n) for (int i = 0; i < (n); ++i)
#define Inf 1000000001


int main(){
	
	int N,K;
	cin>>N>>K;
	
	vector<int> p(N);
	rep(i,N){
		cin>>p[i];
	}
	
	int ans = 0;
	
	rep(i,500){
		int t = 0;
		rep(j,N){
			if(p[j] >= i)t++;
		}
		if(t <= K)ans = max(ans,t);
	}
	
	cout<<ans<<endl;
	
	return 0;
}