N, K = map(int, input().split())
A = list(map(int, input().split()))
for i in range(N):
  A[i] -= K
MOD = 10**9+7
dp = [[0 for _ in range(20001)] for _ in range(N+1)]
dp[0][10000] = 1
for i in range(N):
  a = A[i]
  for j in range(20001):
    dp[i+1][j] = dp[i][j]
    if 0 <= j-a <= 20000:
      dp[i + 1][j] += dp[i][j-a]
ans = 0
for i in range(10000, 20001):
  ans += dp[N][i]
  ans %= MOD
print(ans-1)