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//
//  main.cpp
//  win
//
//  Created by Mikołaj Korulczyk on 09/12/2019.
//  Copyright © 2019 Mikołaj Korulczyk. All rights reserved.
//

#include <bits/stdc++.h>

using namespace std;

int n, k;

int main() {
    scanf("%i%i", &n, &k);
    
    int s, idx, val;
    
    int res = 1e9;
    
    for(int i = 1; i <= n; i++) {
        for(int j = 1; j <= i; j++) {
            //cin >> val;
            scanf("%i", &val);
            s = i+1;
            idx = (s-j)*j;
            
            if(idx <= k) {
                res = min(res, val);
            }
        }
    }
    
    printf("%i\n", res);
    
    return 0;
}