MOD = 10 ** 9 + 7

n, k = map(int, input().split())
A = list(map(int, input().split()))
A = [a - k for a in A]
dp = [0] * 20200
dp[0] = 1
for a in A:
    ndp = [0] * 20200
    for i in range(-10000, 10001):
        ndp[i] += dp[i]
        ndp[i] %= MOD
        ndp[i + a] += dp[i]
        ndp[i + a] %= MOD
    dp = ndp
ans = -1
for i in range(10001):
    ans += dp[i]
    ans %= MOD
print(ans)