import java.io.*; import java.util.*; import java.util.function.*; import java.util.stream.*; public class Main { static int[] values; static List> dp = new ArrayList<>(); public static void main(String[] args) throws Exception { Scanner sc = new Scanner(); int n = sc.nextInt(); int k = sc.nextInt(); values = new int[n]; for (int i = 0; i < n; i++) { values[i] = sc.nextInt(); dp.add(new HashMap<>()); } Arrays.sort(values); System.out.println(dfw(n - 1, k)); } static int dfw(int idx, int v) { if (idx == 0) { return v % values[idx]; } if (!dp.get(idx).containsKey(v)) { dp.get(idx).put(v, Math.max(dfw(idx - 1, v), dfw(idx - 1, v % values[idx]))); } return dp.get(idx).get(v); } } class Scanner { BufferedReader br; StringTokenizer st = new StringTokenizer(""); StringBuilder sb = new StringBuilder(); public Scanner() { try { br = new BufferedReader(new InputStreamReader(System.in)); } catch (Exception e) { } } public int nextInt() { return Integer.parseInt(next()); } public long nextLong() { return Long.parseLong(next()); } public double nextDouble() { return Double.parseDouble(next()); } public String next() { try { while (!st.hasMoreTokens()) { st = new StringTokenizer(br.readLine()); } } catch (Exception e) { e.printStackTrace(); } finally { return st.nextToken(); } } }