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#include <cstdio>
#include <iostream>
#include <algorithm>

using namespace std;
string c;

int main(){
	int n = 0;
	int k = 0;
	int best = 2020;
	int tmp = 2019;
	
	cin >> n;
	cin >> k;
	
	for(int i=0; i<n; ++i){
		int j = 0;
		int q = i;
		while(j <= i){
			cin >> tmp; 
			if((q+1)*(j+1) <= k){
				if(tmp < best){
					best = tmp;
				}
			}
			j++;
			q--;
		}
	}
	
	cout << best << "\n";
	return 0;
}