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#include<cstdio>
#include<iostream>
using namespace std;

int main() {
	ios_base::sync_with_stdio(0);
	int best = 2019;
	int n, k, year;
	int a, b;
	cin >> n >> k;
	for (int i = 1; i <= n; i++) {
		a = i; b = 1;
		for (int j = 1; j <= i; j++) {
			cin >> year;
			if(a*b <= k) {
				best = min(best, year);
			}
			a--; b++;
		}
	}
	cout << best;
	return 0;
}