import times, strutils, sequtils, math, algorithm, tables, sets, lists, intsets
import critbits, future, strformat, deques
template `max=`(x,y) = x = max(x,y)
template `min=`(x,y) = x = min(x,y)
template `mod=`(x,y) = x = x mod y
template scan2 = (scan(), scan())
template scan3 = (scan(), scan())
let read* = iterator: string {.closure.} =
    while true: (for s in stdin.readLine.split: yield s)
proc scan(): int = read().parseInt
proc scanf(): float = read().parseFloat
proc toInt(c:char): int =
    return int(c) - int('0')


proc solve():int=
  var
    n = scan()
    k = scan()
    a = newseqwith(n,scan()).sorted(SortOrder.Descending)
  
  proc dfs(v,idx:int):int=
    if idx==n-1:
      return v.mod(a[idx])
    else:
      result = max(dfs(v.mod(a[idx]),idx+1),dfs(v,idx+1))
  return dfs(k,0)
  
  
  
echo solve()