n, k = map(int, input().split())
p = list(map(int, input().split()))
p.sort()

for m in range(min(k, n), -1, -1):
    if m == 0:
        print(0)
        break
    if m == n:
        if m <= k:
            print(m)
            break
    else:
        if p[n - m] > p[n - m - 1]:
            print(m)
            break