import sys

sys.setrecursionlimit(10 ** 6)
stdin = sys.stdin

ni = lambda: int(ns())
na = lambda: list(map(int, stdin.readline().split()))
ns = lambda: stdin.readline().strip()
ntp = lambda: tuple(map(int, stdin.readline().split()))
mod = 10 * 9 + 7
inf = 2 << 60

n, k = na()
A = na()

Ans = set()

for i in range(1 << n):
    sum = 0
    time = 1
    cnt = 0
    for j in range(n):
        if i & 1 << j:
            sum += A[j]
            time *= A[j]
            cnt += 1
    if cnt >= k:
        Ans.add(sum)
        Ans.add(time)

print(len(Ans))