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#include <iostream>
#include <algorithm>
using namespace std;

long long a[2001010];
int main(){
	ios_base::sync_with_stdio(0);
	long long pot,ilo,raz,on=0,tw,ma,io=2;
	cin>>ilo>>pot;
	tw=0;
	raz=(ilo*(ilo+1))/2;
	for (long long i=0;i<raz;i++)
{
	cin>>a[i];
	}
	if(pot%2==1)pot++;
	while(tw<pot){on++;
		tw=tw+on;
		
	}
	tw=(on*(on+1))/2;
	sort(a,a+tw);
	
	ma=a[0];

	cout<<ma;
	
	
	
	
	return 0;
}