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#include<bits/stdc++.h>
using namespace std;

#define st first
#define nd second
#define mp make_pair
#define pb push_back
#define all(x) x.begin(), x.end()
#define boost ios_base::sync_with_stdio(0);cin.tie(0);cout.tie(0)

typedef long long lli;
typedef pair<int, int> pii;
typedef pair<lli, lli> pll;
typedef pair<lli, int> pli;
typedef pair<int, lli> pil;

const int N = 2137;
int n, k, a, wyn = N;

int32_t main()
{
    boost;
    cin >> n >> k;
    for(int i = 1; i <= n; ++i){
        for(int j = 1; j <= i; ++j){
            cin >> a;
            if(j * (i - j + 1) <= k)wyn = min(wyn, a);
        }
    }
    cout << wyn << "\n";
	return 0;
}