import times, strutils, sequtils, math, algorithm, tables, sets, lists, intsets
import critbits, future, strformat, deques,heapqueue
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()
    need = scan()
    a = @[0] & newseqwith(n,scan())
    md = 10^9+7
    r = a.sum()#100*n
    dp = newseqwith(n+1,newseqwith(n+1,newseqwith(r+1,0)))
  for i in 0..n:
    dp[i][0][0]=1
  for i in 1..n:
    for j in 1..i:
      for k in 0..r:
        if k-a[i]>=0:
          dp[i][j][k]=dp[i-1][j][k]+dp[i-1][j-1][k-a[i]]
        else:
          dp[i][j][k]=dp[i-1][j][k]
        dp[i][j][k].mod=md
  #echo dp[n].join("\n")
  for j in 1..n:
    for k in 0..r:
      if j*need <= k:
        result+=dp[n][j][k]
        result.mod=md
  
    


echo solve()