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#include <iostream>
#include <algorithm>
using namespace std;

int main(){
	ios_base::sync_with_stdio(0);cin.tie(0);cout.tie(0);
	int n, k;
	cin >> n >> k;
	int wynik = 9999;
	for (int i = 1; i <= n; ++i){
		for (int j = 1; j <= i; ++j){
			int a;
			cin >> a;
			int kt = j * (i - j + 1);
			if (kt <= k)
				wynik = min(wynik, a);
		}
	}
	cout << wynik << "\n";
}