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//Bartek_Kolakowski
#include <iostream>
#include <cmath>
#include <cstdio>
using namespace std;

int tab [2000100];

int main()
{
	int n;
	cin >> n;
	int k;
	cin >> k;
	int x;
	x = (n*(n+1))/2;
	for (int i =1; i<= x; i++)
	{
		cin >> tab [i];
	}
	
	
	int i =0;
	int y;
	y = 2020;
	do
	{
		i=i+1;
		int a;
		a =i;
		int b;
		b =i;
		for (a; a<= (b*(b+1))/2; a++ )
		{
			//cout << tab [a]<<endl;
			if (tab [a] < y)
			{
				y = tab [a];
			}
		}
		//cout << i << " "<< ((i*(i+1))/ 2) << endl;
		
	}
	while (k > ((i*(i+1))/ 2));
	
	cout  << y <<endl;
	
	return 0;
}