import numpy as np
import copy

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

sumA = sum(A)
prodA = np.prod(np.array(A))

ans = [sumA]
if sumA != prodA:
    ans.append(prodA)

q = [(A, sumA, prodA)]

cnt = N - K
while cnt > 0:
    new_q = []
    for an, s, p in q:
        for a in an:
            isAdd = False
            if s-a not in ans:
                ans.append(s-a)
                isAdd = True
            if p//a not in ans:
                ans.append(p//a)
                isAdd = True
            if isAdd:
                new_an = copy.copy(an)
                new_an.remove(a)
                new_q.append((new_an, s-a, p//a))  
    q = new_q
    cnt -= 1

print(len(ans))