m = 1000000007

N, K, *A = map(int, open(0).read().split())

for i in range(N):
    A[i] -= K

dp = {}
dp[0] = 1
for a in A:
    if a == 0:
        for k in dp:
            dp[k] += 1
    elif a > 0:
        for k in sorted(dp, reverse=True):
            dp.setdefault(k + a, 0)
            dp[k + a] += dp[k]
    elif a < 0:
        for k in sorted(dp):
            dp.setdefault(k + a, 0)
            dp[k + a] += dp[k]

print((sum(dp[k] for k in [k for k in dp if k >= 0]) - 1) % m)