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#include <iostream>
#include <algorithm>

using namespace std;

int fun(int i, int j) {
	return(i*j + i - j * j + 1);
}

int main()
{
	ios_base::sync_with_stdio(0);
	cin.tie(0);
	int n, k, r, min = INT32_MAX;
	cin >> n >> k;
	int minp = std::min(n, k);
	for (int i = 0; i < minp; ++i) {
		for (int j = 0; j < i + 1; ++j) {
			cin >> r;
			if (fun(i, j) <= k) {
				if (r < min) {
					min = r;
				}
			}
		}
	}
	cout << min;
	return 0;
}