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#include <bits/stdc++.h>

using namespace std;

int main() {
	ios_base::sync_with_stdio(false);
	cin.tie(0);
	cout.tie(0);
	
	int n, k;
	cin >> n >> k;
	const int inputSize = n * (n + 1) / 2;
	int col = 0;
	int row = 2;
	int rowSize = 2;
		
	int minVal;
	cin >> minVal;
	for (int i = 1; i < inputSize; i++) {
		int val;
		cin >> val;
		int cost = (col + 1) * (rowSize - col);
		if (cost <= k)
			minVal = min(minVal, val);
		col++;
		if (col == rowSize) {
			col = 0;
			row++;
			rowSize++;
		}
	}
	cout << minVal;
}