from collections import *

N, K = map(int, input().split())
A = list(map(int, input().split()))
A = list(map(lambda x: x-K, A))
dp = defaultdict(int)
dp[0] = 1
MOD = 10**9+7

for i in range(N):
    ndp = defaultdict(int)
    
    for k in dp:
        ndp[k] = (ndp[k]+dp[k])%MOD
        ndp[k+A[i]] = (ndp[k+A[i]]+dp[k])%MOD

    dp = ndp
    
ans = 0

for k in dp:
    if k>=0:
        ans = (ans+dp[k])%MOD

print((ans-1)%MOD)