mod = 1000000007
eps = 10**-9


def main():
    import sys
    input = sys.stdin.readline

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

    S = set()
    for i in range(1 << N):
        s = 0
        p = 1
        cnt = 0
        for j in range(N):
            if i >> j & 1:
                cnt += 1
                s += A[j]
                p *= A[j]
        if cnt >= K:
            S.add(s)
            S.add(p)
    print(len(S))


if __name__ == '__main__':
    main()