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#include <iostream>
#include <string>
using namespace std;
int main()
{
	long n, k;
	std::cin >> n >> k;
	int minYear = 3000;
	int bottleYear = 0;
	for (int i=1;i<=n;i++)
	{
		for (int pos = 1;pos <= i;pos++)
		{
			cin >> bottleYear;
			int howManyAbove = (i - pos + 1) * pos;
			if (howManyAbove <= k && bottleYear < minYear)
			{
				minYear = bottleYear;
			}
		}
	}
	cout << minYear;
	return 0;
}