import sys
def II(): return int(sys.stdin.readline())
def LI(): return list(map(int, sys.stdin.readline().split()))
def LC(): return list(input())
def IC(): return [int(c) for c in input()]
def MI(): return map(int, sys.stdin.readline().split())
INF = float('inf')
def solve():
    N,K = MI()
    A = LI()
    from collections import defaultdict
    Num = defaultdict(lambda: 0)
    for i in range(2**N):
        Cook = []
        for j in range(N):
            if((i>>j) & 1):
                Cook.append(A[j])
        if(len(Cook)>=K):
            Num[sum(Cook)] = 1
            Tmp = 1
            for c in Cook:
                Tmp*=c
            Num[Tmp] = 1
    Ans = list(Num.keys())
    print(len(Ans))
    return
solve()