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#include<bits/stdc++.h>
using namespace std;
int main(){
	int n,k,i,j,y,result;
	scanf("%d%d",&n,&k);
	result=2019;
	for(j=1;j<=n;j++)
		for(i=1;i<=j;i++){
			scanf("%d",&y);
			if(i*(j-i+1)<=k)
				result=min(result,y);
		}
	printf("%d",result);
	return 0;
}