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#include <iostream>
using namespace std;

const int N = 2000;
int tab[N][N];

int main()
{
   ios_base::sync_with_stdio(0);
   cin.tie(0);
   
   int n, k, i, j, x, m;
   cin>>n>>k;
   for(i = 0; i < n; i++)
   {
     for(j = 0; j <= i; j++)
     {
       cin>>tab[i][j];
     }
   }
   x = tab[0][0];
   for(j = 0; j < n;j++)
   {
     for(i = j, m = j + 1;m <= k && i < n;i++, m += j + 1)
     {
       if(tab[i][j] < x)
         x = tab[i][j];
     }
   }
   cout<<x;
}