/* -*- coding: utf-8 -*-
 *
 * 1083.cc:  No.1083 余りの余り - yukicoder
 */

#include<cstdio>
#include<cstdlib>
#include<cstring>
#include<cmath>
#include<iostream>
#include<string>
#include<vector>
#include<map>
#include<set>
#include<stack>
#include<list>
#include<queue>
#include<deque>
#include<algorithm>
#include<numeric>
#include<utility>
#include<complex>
#include<functional>
 
using namespace std;

/* constant */

const int MAX_N = 20;
const int NBITS = 1 << MAX_N;

/* typedef */

/* global variables */

int as[MAX_N];

/* subroutines */

inline void setmax(int &a, int b) { if (a < b) a = b; }

/* main */

int main() {
  int n, k;
  scanf("%d%d", &n, &k);

  for (int i = 0; i < n; i++) scanf("%d", as + i);
  sort(as, as + n, greater<int>());

  int nbits = 1 << (n - 1);
  int maxx = 0;

  for (int bits = 0; bits < nbits; bits++) {
    int x = k;
    for (int i = 0, bi = 1; i < n - 1; i++, bi <<= 1)
      if (bits & bi) x %= as[i];
    x %= as[n - 1];
    setmax(maxx, x);
  }

  printf("%d\n", maxx);
  return 0;
}