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#include<bits/stdc++.h>
using namespace std;
int main()
{
     int n,k,i,j,m=1000000,a;
     scanf("%d%d",&n,&k);
     for (i=1;i<=n;++i)
     {
         for (j=1;j<=i;++j)
         {
              scanf("%d",&a);
              if (j*(i-j+1)<=k) m=min(m,a);
         }
     }
     printf("%d",m);
}