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#include <iostream>

using namespace std;

int main()
{
	int k;
	int n;
	cin >> n;
	cin >> k;
	int x=0;
	int najstarsza=2020;
	int tmp;
	

	for (int i = 0;i < n;i++)
	{
		for (int j = 0;j <= i;j++)
		{
			cin >> tmp;
			if (najstarsza > tmp)
				najstarsza = tmp;
			x++;
		}
		if (x > k)
			break;
	}

	cout << najstarsza <<endl;
	return 0;
}