import sys
input = lambda : sys.stdin.readline().rstrip()
sys.setrecursionlimit(max(1000, 10**9))
write = lambda x: sys.stdout.write(x+"\n")


n,k = list(map(int, input().split()))
a = list(map(int, input().split()))
a = [item-k for item in a]
ma = sum([-item for item in a if item<0])
Ma = sum([item for item in a if item>0])
dp = [0]*(ma+Ma+10)
dp[ma] = 1
M = 10**9+7
for i in range(n):
    ndp = [0]*(ma+Ma+10)
    for j in range(ma+Ma+10):
        ndp[j] = dp[j]
        if 0<=j-a[i]<ma+Ma+10:
            ndp[j] += dp[j-a[i]]
        ndp[j] %= M
    dp = ndp
#     print(dp)
ans = sum(dp[j] for j in range(ma, ma+Ma+1))-1
print(ans%M)