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#include<cstdio>
#include<algorithm>
using namespace std;

int n,k,x,wyn;

int main()
{
	int wyn=1000000000;

	scanf("%d%d",&n,&k);
	for(int i=1;i<=n;i++)
	{
		for(int j=1;j<=i;j++)
		{
			scanf("%d",&x);
			if(j*(i-j+1)<=k)wyn=min(wyn, x);
		}
	}

	printf("%d",wyn);
}