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#include <iostream>
using namespace std;

unsigned n,k,m;

int main() {
	// your code goes here
	scanf("%u%u",&n,&k);
	m=2020;
	for(int i=1;i<=n;i++)
	{
		for(int j=1;j<=i;j++)
		{
			unsigned r = 0;
			scanf("%u",&r);
			if((i-j)+1 <= k/j && r<m) m=r;
		}
	}
	printf("%u",m);
	return 0;
}