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#include <bits/stdc++.h>
using namespace std;
vector<int>t;
int n,k,a,w;
int main()
{
	cin>>n>>k;
	for(int i=0; i<n; i++)
	{
		cin>>a;
		t.push_back(a);
	}
	sort(t.begin(),t.end());
	//cout<<t[0]<<"\n";
	a=n-1;
	while(t[a]>=t[n-k])
	{
		//cout<<t[a]<<"\n";
		w++;
		a--;
	}
	cout<<w<<"\n";
}