def main0(n,k,a):
  mod=10**9+7
  from collections import defaultdict
  # dp[i][j]:i人選んで合計点がjの場合数。
  aa=[x-k for x in a]
  dp=[0]*(200*n+1)
  dp[0]=1
  for i in range(n):
    ndp=dp[:]
    for j in reversed(range(-100*n,100*n+1)):
      if dp[j]==0:continue
      ndp[j+aa[i]]+=dp[j]
      ndp[j+aa[i]]%=mod
    dp=ndp
  ans=-1
  for i in range(100*n+1):
    ans+=dp[i]
    ans%=mod
  return ans
if __name__=='__main__':
  n,k=map(int,input().split())
  a=list(map(int,input().split()))

  ret0=main0(n,k,a)
  print(ret0)