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#include <iostream>
#include <vector>
#include <algorithm>

using namespace std;

int main() {
	int k, n;
	cin >> n >> k;

	int bestOne = 2020;

	for (int i = 1; i <= n; i++) {
		for (int j = 1; j <= i; j++) {
			int year;
			cin >> year;

			if (j * (i - j + 1) <= k) {
				bestOne = std::min(bestOne, year);
			}
		}
	}

	cout << bestOne << endl;
}