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#include <iostream>
using namespace std;

int main() {
	int n,k,a;
	
	scanf("%d%d",&n,&k);
	
	int min = 2020;
	for (int i=1; i<=n; i++)
		for (int j=1; j<=i; j++)
		{
			scanf("%d",&a);
			int x = (i-j+1)*j;
			if (x <= k && a < min)
				min = a;
		}
	printf("%d",min);
}