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#include <bits/stdc++.h>
using namespace std;
typedef long long ll;

const int maxN = 2003;
int N, K, year, result = 2020;



int main()
{
	scanf("%d%d", &N, &K);
	for(int row = 1; row < N + 1; row ++)
		for(int place = 1; place < row + 1; place ++)
		{
			scanf("%d", &year);
			if((row - place + 1) * place <= K)
				result = min(result, year);
		}
	
	printf("%d\n", result);
	return 0;
}