import sys
input = sys.stdin.readline
from collections import *

N, K = map(int, input().split())
A = list(map(int, input().split()))
s = set()

for S in range(1<<N):
    l = []
    
    for i in range(N):
        if (S>>i)&1:
            l.append(A[i])
    
    if len(l)<K:
        continue
    
    s.add(sum(l))
    v = 1
    
    for li in l:
        v *= li
    
    s.add(v)

print(len(s))