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#include <iostream>
#include <vector>

using namespace std;

int main() {
	ios_base::sync_with_stdio(0);

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

	int best = 3000;

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

			int above = j * (i - j + 1);
			if (above <= k) best = year;
		}
	}

	cout << best << endl;

	return 0;
}