import numpy as np
n, k = map(int, input().split())
a = list(map(int, input().split()))
a = list(map(lambda x: x - k, a))
mod = 10 ** 9 + 7
dp = [0] * 20001
dp[10000] = 1
for i in a:
    new = dp[:]
    for j in range(20001):
        if 0 <= i + j <= 20000:
            new[i + j] += dp[j]
            new[i + j] %= mod
    dp = new
print((sum(dp[10000:]) - 1) % mod)