import sys
input = sys.stdin.readline

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

for i in range(1<<N):
    X=[]
    for j in range(N):
        if i & (1<<j) != 0:
            X.append(A[j])

    if len(X)>=K:
        ANS.add(sum(X))
        l=1
        for x in X:
            l*=x
        ANS.add(l)

print(len(ANS))