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#include<bits/stdc++.h>

using namespace std;

void solve() {

	int n, k;
	cin >> n >> k;

	int wynik = 3030;

	for (int i = 1; i <= n; i++) {
		for (int j = 1; j <= i; j++) {
			int x;
			cin >> x;
			int d = j * (i - j + 1);
			if (d <= k) {
				wynik = min(wynik, x);
			}
		}
	}

	cout << wynik;

	return;
}

int32_t main() {
	ios_base::sync_with_stdio(0);
	cin.tie(0);
	cout.tie(0);

	int t = 1;
	//cin >> t;
	while(t--)
		solve();
	return 0;
}