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#include <iostream>

int main() {
	int n, k;
	std::cin >> n >> k;
	int year, min = 2020;
	for (int i = 1; i <= n; i++) {
		for (int j = 1; j <= i; j++) {
			std::cin >> year;
			if (k < j * (i - j + 1))
				continue;
			min = year < min ? year : min;
		}
	}
	std::cout << min << std::endl;
}