import sys

input = sys.stdin.buffer.readline
n, k = map(int, input().split())
A = list(map(int, input().split()))

ans = set()
popcnt = [0] * ((1 << n) + 10)
for i in range(1 << n):
    popcnt[i] = popcnt[i // 2] + i % 2
    if popcnt[i] >= k:
        goukei = 0
        prod = 1
        for j in range(n):
            if (i >> j) & 1:
                goukei += A[j]
                prod *= A[j]
        ans.add(goukei)
        ans.add(prod)
        # print(goukei)
        # print(prod)

print(len(list(ans)))