mod = 10**9+7
N,K = map(int,input().split())
A = [x-K for x in map(int,input().split())]
dp = [0]*21000
dp[10500] = 1
for a in A:
    if a >= 0:
        for i in range(100,20900)[::-1]:
            dp[i+a] += dp[i]
    else:
        for i in range(100,20900):
            dp[i+a] += dp[i]
print((sum(dp[10500:])-1) % mod)