n,k = map(int,input().split())
a = list(map(int,input().split()))
dp = [[0]*(20005) for i in range(n+1)]
dp[0][10000] = 1
mod = 10**9+7
for i in range(n):
    x = a[i]-k
    for j in range(20001):
        if dp[i][j] > 0:
            dp[i+1][j+x] += dp[i][j]
            dp[i+1][j+x] %= mod
        dp[i+1][j] += dp[i][j]

print((sum(dp[-1][10000:])-1)%mod)