#include <bits/stdc++.h>
namespace chtholly {
char buf[1 << 23], *p1 = buf, *p2 = buf;
inline int read() {
  int x = 0, f = 1;
  char c = getchar();
  for (; !isdigit(c); c = getchar()) f ^= c == '-';
  for (; isdigit(c); c = getchar()) x = (x << 3) + (x << 1) + (c ^ '0');
  return f ? x : -x;
}
template <typename mitsuha>
inline bool read(mitsuha &x) {
  x = 0;
  int f = 1;
  char c = getchar();
  for (; !isdigit(c) && ~c; c = getchar()) f ^= c == '-';
  if (!~c) return 0;
  for (; isdigit(c); c = getchar()) x = (x << 3) + (x << 1) + (c ^ '0');
  return x = f ? x : -x, 1;
}
template <typename mitsuha>
inline int write(mitsuha x) {
  if (!x) return 0 & putchar(48);
  if (x < 0) putchar('-'), x = -x;
  int bit[20], i, p = 0;
  for (; x; x /= 10) bit[++p] = x % 10;
  for (i = p; i; --i) putchar(bit[i] + 48);
  return 0;
}
inline char fuhao() {
  char c = getchar();
  for (; isspace(c); c = getchar())
    ;
  return c;
}
}  // namespace chtholly
using namespace chtholly;
using namespace std;
const int yuzu = 3e5, mulu = 1e6;
typedef int fuko[mulu << 1 | 9];
fuko a, mxp;
int main() {
  int x, i, j, n, k;
  read(n), read(k);
  for (i = 1; i <= n; ++i) a[read()]++;
  for (x = 1; !a[x]; ++x)
    ;
  for (i = 1; i <= mulu << 1; ++i) a[i] += a[i - 1];
  for (i = x; i; --i) {
    int llx = 0;
    for (j = i; j <= mulu; j += i) llx += a[j + k] - a[j - 1];
    if (llx >= n) return write(i);
  }
}
