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#include <cstdio>
using namespace std;


int main() {
  long result = 0;
  long n, k;
  long x;
  scanf("%ld %ld\n", &n, &k);
  for(int h=0; h<n; h++) {
    for (int i=0; i<=h; i++) {
      scanf("%ld", &x);
      
      long c = (i+1) * (h-i+1);
      //printf("%ld %ld %ld %ld\n", h, i, c, x);
      if (c <= k) {
        if (result == 0) {
          result = x;
        } else if(x < result) {
          result = x;
        }
      }
    }
  }

  printf("%ld\n", result);
  return 0;
}