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#include <cstdio>

int main() {
  int n, k;
  int res = 2020;
  scanf("%d%d", &n, &k);
  for (int i = 1; i <= n; ++i) {
    for (int j = 1; j <= i; ++j) {
      int x;
      scanf("%d", &x);
      if (j * (i - j + 1) <= k &&  x < res) {
        res = x;
      }
    }
  }
  printf("%d\n", res);
  return 0;
}