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#include <bits/stdc++.h>
// #pragma GCC optimize ("O3")
// #pragma GCC target ("sse4")
using namespace std;

typedef long long LL;
typedef unsigned long long ULL;
typedef pair<int,int> PII;

#define REP(i,n) for(int i=0;i<(n);++i)
#define FOR(i,a,b) for (int i=(a); i<(b); ++i)
#define FORD(i,a,b) for (int i=(a)-1; i>=(b); --i)
#define MAX(dst,src) dst = max(dst, (src))
#define MIN(dst,src) dst = min(dst, (src))

#define pb push_back
#define mp make_pair
#define st first
#define nd second

void scase() {
  int N, K;
  if (scanf("%d%d", &N, &K) < 2) {
    exit(0);
  }
  int result = 3000;
  FOR(i,1,N+1)FOR(j,1,i+1) {
    int value;
    scanf("%d", &value);
    int w = min(j,i-j+1);
    int k = w * (i-w+1);
    if (k <= K) MIN(result, value);
  }
  printf("%d\n", result);
}

int main(int argc, char* argv[]) {
  while(true) scase();
}