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#include <stdio.h>

int main()
{
int N,n,K,k,i,j,v,mv = 2020;

	scanf("%d %d",&N,&K);
	
	for (n = 0; n < N; n++)
	{
		i = n + 1;
		j = 1;
		for (k = 0; k < n+1; k++)
		{
			scanf("%d",&v);
			if (i*j <= K && v < mv) mv = v;
			i--;
			j++;
		}
	}
	
	printf("%d\n",mv);
	
	return 0;
}