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

A = list(map(int,input().split()))
P = [0]*100010

for a in A:
    P[a] += 1

P.sort(reverse = True)

c = 0
for i in range(len(P)):
    K -= P[i]
    if K <= 0:
        print(i+1)
        break