n,k = map(int,input().split())
*a, = map(int,input().split())
N = 1<<n
s = [0]*N
p = [1]*N
v = [0]*N
for i in range(n):
    V = 1<<i
    for j in range(V):
        s[j+V] = s[j] + a[i] 
        p[j+V] = p[j] * a[i] 
        v[j+V] = v[j] + 1 
ans = set()
for i in range(N):
    if v[i] >= k:
        ans.add(s[i])
        ans.add(p[i])
print(len(ans))