n,a = map(int,input().split())
x = list(map(int,input().split()))
dp = [[[0]*(n*max(max(x),a)+1) for i in range(n+1)] for j in range(n+1)]
dp[0][0][0] = 1
for i in range(1,n+1):
    for j in range(n+1):
        for k in range(n*max(max(x),a)+1):
            dp[i][j][k] = dp[i-1][j][k]
            if x[i-1] <= k and j>0:
                dp[i][j][k] += dp[i-1][j-1][k-x[i-1]]
ans = 0
for j in range(1,n+1):
    ans += dp[n][j][j*a]
print(ans)