# region template

import typing
import math
import sys
import copy
import itertools
import collections
import bisect
import heapq
import decimal


def ni(): return int(sys.stdin.readline())
def ns(): return map(int, sys.stdin.readline().split())
def ns1(): return map(lambda x: int(x)-1, sys.stdin.readline().split())
def na(): return list(map(int, sys.stdin.readline().split()))
def na1(): return list(map(lambda x: int(x)-1, sys.stdin.readline().split()))
def nall_i(): return list(map(int, sys.stdin.read().split()))
def nall_s(): return list(map(str, sys.stdin.read().split()))
def flush(): return sys.stdout.flush()
def nib(): return int(sys.stdin.buffer.readline())
def nsb(): return map(int, sys.stdin.buffer.readline().split())
def ns1b(): return map(lambda x: int(x)-1, sys.stdin.buffer.readline().split())
def nab(): return list(map(int, sys.stdin.buffer.readline().split()))
def na1b(): return list(map(lambda x: int(x)-1, sys.stdin.buffer.readline().split()))
def nallb(): return list(map(int, sys.stdin.buffer.read().split()))
# endregion


# sys.setrecursionlimit(10**7+1)
inf = 10**23
# MOD = 10**9+7
MOD = 998244353


def main():
    N, K = ns()
    A = na()

    cnt = collections.Counter(A)
    rem = K
    res = 0
    for k,v in sorted(cnt.items(), key=lambda x: x[1], reverse=True):
        if rem > 0:
            rem -= v
            res += 1
    print(res)


if __name__ == '__main__':
    main()