n,k = map(int,input().split())
a = list(map(int,input().split()))
a = sorted(a)

s = sum(a)
d = [[0 for j in range(s+1)] for i in range(n+1)]
d[0][0] = 1

for x in a:
    d_next = [[0 for j in range(s+1)] for i in range(n+1)]
    d[0][0] = 1
    for i in range(n):
        for j in range(s):
            d_next[i][j] += d[i][j]
            if j+x <= s:
                d_next[i+1][j+x] += d[i][j]
    d = d_next

        
ans = 0
for i in range(s+1):
    for j in range(1,n+1):
        if i >= j*k:
            ans += d[j][i]
print(ans)