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#include <iostream>
using namespace std;

int main() {
	ios_base::sync_with_stdio(0);
	
	int n, k, result = 2020, a;
	cin >> n >> k;
	
	for (int i = 1; i <= n; i++) {
		for (int j = 0; j < i; j++) {
			cin >> a;

			if ((i - j) * (j + 1) <= k && a < result) {
				result = a;
			}
		}
	}
	
	cout << result;
	
	return 0;
}