def main():
  m=10**9+7
  n,k=map(int,input().split())
  a=list(map(int,input().split()))
  for i in range(n):
    a[i]-=k
  dp=[[0]*20001 for _ in range(n+1)]
  dp[0][0]=1
  for i in range(n):
    for j in range(-10000,10001):
      dp[i][j]%=m
      if -10000<=j+a[i] and j+a[i]<=10000:
        dp[i+1][j]+=dp[i][j]
        dp[i+1][j+a[i]]+=dp[i][j]
  print((sum(dp[n][:10000])-1+m)%m)
main()