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#include <bits/stdc++.h>
using namespace std;
#define endl '\n'

int main()
{
	ios_base::sync_with_stdio(0);
	cin.tie(0);
	int n, k, p = 1, w = 0;
	cin >> n >> k;
	int t[n][n] = {}, l[n][n] = {};
	for(int i = 0; i < n; i++)
	{
		for(int j = 0; j < p; j++)
		{
			cin >> t[i][j];
			if(w == 0)
			{
				w = t[i][j];
			}
			else
			{
				if(j != 0 && j != p - 1)
				{
					l[i][j] = l[i - 1][j - 1] + i - j + 1;
				}
				else
				{
					l[i][j] = i;
				}
				if(l[i][j] < k && t[i][j] < w)
				{
					w = t[i][j];
				}
			}
		}
		p++;
	}
	cout << w;
}