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

P.sort(reverse=True)

if N == K or P[K-1] != P[K]:
    print(K)
else:
    B = P[K-1]
    for i in range(K-2, -1, -1):
        if P[i] != B:
            print(i+1)
            break
    else:
        print(0)