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#include<iostream>
#include<cstdio>

using namespace std;

int main() {
	std::ios::sync_with_stdio(false);

	int height, no, year, k, tmp, min;
	cin >> height;
	cin >> no;
	
	k = 1;
	min = 2019;

	for (int i = 0; i < height; ++i) {

		k = i + 1;

		for (int j = 0; j < i + 1; ++j) {	
			tmp = k * (j + 1);
			cin >> year;

			if (year < min && tmp <= no) {
				min = year;
			}

			k--;
		}

		k = 1;

	}

	cout << min << endl;
}