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// PA1B.cpp : This file contains the 'main' function. Program execution begins and ends there.
//

#include <iostream>
#include<vector>

using namespace std;

vector<int> current;
vector<int> oneUp;
vector<int> twoUp;

int n, k;
int m;

int main()
{
	std::ios_base::sync_with_stdio(false);

	cin >> n >> k;

	cin >> m;
	twoUp.push_back(1);
	if (n > 1)
	{
		if (n == 2)
		{
			if (k >= 2)
			{
				int j;
				cin >> j;
				if (j < m)
					m = j;

				cin >> j;
				if (j < m)
					m = j;
			}
			else
			{
				cin >> k;
				cin >> k;
			}
		}
		else 
		{
			int temp;
			cin >> temp;
			if (temp < m)
				m = temp;
			oneUp.push_back(2);

			cin >> temp;
			if (temp < m)
				m = temp;
			oneUp.push_back(2);

			for (int i = 2; i < n; i++)
			{
				for (int j = 0; j < i + 1; j++)
				{
					cin >> temp;
					int value = 0;
					if (j == 0)
					{
						value = oneUp[0] + 1;
					}
					else if (j == i)
					{
						value = oneUp[j - 1] + 1;
					}
					else
					{
						value = oneUp[j - 1] + oneUp[j] + 1 - twoUp[j - 1];
					}
					if (value <= k && temp < m)
						m = temp;
					current.push_back(value);
				}
				twoUp = oneUp;
				oneUp = current;
				current.clear();
			}
		}
	}

	cout << m;
}