from collections import defaultdict

MOD = 10 ** 9 + 7
N, K = map(int, input().split())
A = list(map(lambda x: int(x) - K, input().split()))

dp = defaultdict(int)
dp[0] = 1

for a in A:
    for key, cnt in dp.copy().items():
        dp[key + a] += cnt
        dp[key + a] %= MOD

ans = sum(cnt for key, cnt in dp.items() if key >= 0)
print((ans % MOD) - 1)