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#include <iostream>
using namespace std;
int main(int argc, char *argv[])
{
	long long n, k, t, m = 200000000000000000; cin>>n>>k;
	for(int i=1;i<n+1;i++){
		for(int j=1;j<i+1;j++){
			cin>>t; if(t<m && j*(i-j+1)<=k)
			 {
			 	m=t;
			 }
		}
	}
	cout<<m;
	return 0;
}