n,k = map(int,input().split())
a = list(map(int,input().split()))
dp = [0]*(20001)
dp[10000] = 1
mod = 10**9+7
for i in range(n):
    x = a[i]-k
    ndp = [0]*(20001)
    for j in range(20001):
        if dp[j] > 0:
            ndp[j+x] += dp[j]
            ndp[j+x] %= mod
        ndp[j] += dp[j]
    dp = ndp
print((sum(dp[10000:])-1)%mod)