import numpy as np

N, A = map(int, input().split())
X = [0] + list(map(int, input().split()))
NX = N * max(X + [A])

dp = np.zeros((N + 1, N + 1, NX + 1), dtype=int)

dp[0][0][0] = 1

for j in range(N + 1):
    for k in range(N + 1):
        for s in range(NX + 1):
            if j >= 1 and s < X[j]:
                dp[j][k][s] = dp[j - 1][k][s]
            elif j >= 1 and k >= 1 and s >= X[j]:
                dp[j][k][s] = dp[j - 1][k][s] + dp[j - 1][k - 1][s - X[j]]

ret = 0

for k in range(1, N + 1):
    ret += dp[N][k][k * A]

print(ret)
