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#include <bits/stdc++.h>
#define ll long long int
#define mp make_pair
#define pb push_back
#define ld long double
#define pa pair<int,int>
#define st first
#define nd second
#define vi vector<int>
#define BOOST ios_base::sync_with_stdio(false);cin.tie(0);cout.tie(0);
//#pragma GCC target ("avx2")
//#pragma GCC optimization ("O3")
//#pragma GCC optimization ("unroll-loops")
using namespace std;
const int inf=1e9+9;
int ans=inf;
int main()
{
    BOOST;
    int n,k;
    cin>>n>>k;
    for (int i=1;i<=n;i++)
    {
      for (int j=1;j<=i;j++)
      {
        int pole=j*(i-j+1);
        int a;
        cin>>a;
        if (pole<=k)ans=min(ans,a);
      }
    }
    cout<<ans;
    return 0;
}