def main1(n,k,a):
  mod=10**9+7
  aa=[x-k for x in a]
  am=[]
  a0=[]
  ap=[]
  for x in aa:
    if x==0:a0.append(x)
    if x<0:am.append(x)
    if x>0:ap.append(x)
  dpp=[0]*(101*n)
  dpm=[0]*(101*n)
  dpp[0]=1
  for x in ap:
    for i in range(101*n-1,-1,-1):
      if dpp[i]==0:continue
      dpp[i+x]+=dpp[i]
      dpp[i+x]%=mod
  dpm[0]=1
  for x in am:
    x=abs(x)
    for i in range(101*n-1,-1,-1):
      if dpm[i]==0:continue
      dpm[i+x]+=dpm[i]
      dpm[i+x]%=mod
  sdpp=[0]
  for x in dpp:sdpp.append(sdpp[-1]+x)
  ret=0
  for i in range(101*n):
    ret+=dpm[i]*(sdpp[-1]-sdpp[i])
    ret%=mod
  ret*=pow(2,len(a0),mod)%mod
  ret-=1
  return ret%mod


if __name__=='__main__':
  n,k=map(int,input().split())
  a=list(map(int,input().split()))
  ret1=main1(n,k,a)
  print(ret1)