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#include <stdio.h>
#include <stdlib.h>

#define MAXN 2048
#define MAXNN (MAXN*MAXN)

int ia = 0;
int a[MAXNN];

int main() {
  int n, k, m;
  scanf("%d%d", &n, &k);
  for (int i=1;i<=n;i++) {
    for (int j=1;j<=i;j++) {
      scanf("%d", &a[ia]);
      ia++;
    }
  }
  m = 2019;
  for (int i=0;i<n;i++) {
    for (int j=0;j<=i;j++) {
      if ((j+1)*(i-j+1)<=k && m>a[j+(i+1)*i/2])
        m = a[j+(i+1)*i/2];
//      printf("%d  ", a[j+(i+1)*i/2]);
      //printf("%dx%d ", j+1, i-j+1);
    }
    //printf("\n");
  }
  printf("%d\n", m);
  return 0;
}