import java.util.*; import java.io.*; class Main{ void solve(PrintWriter out, In in) { int n = in.nextInt() , k = in.nextInt(); int [] A = in.IntArray(n); ArrayList pair = new ArrayList<>(); HashMap mp = new HashMap<>(); for(int i = 0 ; i < n ; i ++ ) { mp.put(A[i],mp.getOrDefault(A[i],0)+1); } for(int v : mp.keySet()) { pair.add(new Pair(v,mp.get(v))); } Collections.sort(pair,Comparator.comparing(Pair::second,Comparator.reverseOrder())); HashSet s = new HashSet<>(); int num = 0 ; for(int i = 0 ; i < pair.size() ; i ++ ) { if(num + pair.get(i).second() <= k) { num += pair.get(i).second(); s.add(pair.get(i).first()); } } out.print(s.size()); } /* Library */ /* ------- */ public static void main(String[] args) { PrintWriter out = new PrintWriter(System.out); In in = new In(); new Main().solve(out,in); out.flush(); } final long MOD7 = 1000000007; final long MOD9 = 998244353 ; final int [] X4 = {0,1,0,-1}; final int [] Y4 = {-1,0,1,0}; final int [] X8 = {-1,-1,0,1,1,1,0,-1}; final int [] Y8 = {0,1,1,1,0,-1,-1,-1}; final int Inf = (int)1e9; final long Lnf = (long)1e18; final String yes = "Yes"; final String no = "No"; } /* Class */ /* ----- */ class Pair{ private int first ; private int second; Pair(int first,int second) { this.first = first; this.second = second; } int first() { return this.first ; } int second() { return this.second; } @Override public String toString(){ return first()+" = "+second(); } } class PairII { private int first ; private int second ; private int third; PairII(int first, int second, int third) { this.first = first; this.second = second; this.third = third; } int first() { return this.first ; } int second() { return this.second; } int third() { return this.third ; } @Override public String toString(){ return first()+" = "+second()+" = "+third() ; } } class In{ private final InputStream in = System.in; private final byte[] buffer = new byte[1024]; private int ptr = 0; private int buflen = 0; private boolean hasNextByte() { if (ptr < buflen) { return true; }else{ ptr = 0; try { buflen = in.read(buffer); } catch (IOException e) { e.printStackTrace(); } if (buflen <= 0) { return false; } } return true; } private int readByte() { if (hasNextByte()) return buffer[ptr++]; else return -1; } private static boolean isPrintableChar(int c) { return 33 <= c && c <= 126; } public boolean hasNext() { while(hasNextByte() && !isPrintableChar(buffer[ptr])) { ptr++; } return hasNextByte(); } String next() { if (!hasNext()) throw new NoSuchElementException(); StringBuilder sb = new StringBuilder(); int b = readByte(); while(isPrintableChar(b)) { sb.appendCodePoint(b); b = readByte(); } return sb.toString(); } long nextLong() { if (!hasNext()) throw new NoSuchElementException(); long n = 0; boolean minus = false; int b = readByte(); if (b == '-') { minus = true; b = readByte(); } if (b < '0' || '9' < b) { throw new NumberFormatException(); } while(true){ if ('0' <= b && b <= '9') { n *= 10; n += b - '0'; }else if(b == -1 || !isPrintableChar(b)){ return minus ? -n : n; }else{ throw new NumberFormatException(); } b = readByte(); } } int nextInt() { long nl = nextLong(); if (nl < Integer.MIN_VALUE || nl > Integer.MAX_VALUE) throw new NumberFormatException(); return (int) nl; } double nextDouble() { return Double.parseDouble(next()); } int [] IntArray(int n) { final int [] Array = new int [n]; for(int i = 0 ; i < n ; i ++ ) { Array[i] = nextInt(); } return Array; } int [][] IntArray(int n , int m) { final int [][] Array = new int [n][m]; for(int i = 0 ; i < n ; i ++ ) { Array[i] = IntArray(m); } return Array; } long [] LongArray(int n) { final long [] Array = new long [n]; for(int i = 0 ; i < n ; i ++ ) { Array[i] = nextLong(); } return Array; } long [][] LongArray(int n , int m) { final long [][] Array = new long [n][m]; for(int i = 0 ; i < n ; i ++ ) { Array[i] = LongArray(m); } return Array; } String [] StringArray(int n) { final String [] Array = new String [n]; for(int i = 0 ; i < n ; i ++ ) { Array[i] = next(); } return Array; } char [] CharArray(int n) { final char [] Array = new char[n]; for(int i = 0 ; i < n ; i ++ ) { Array[i] = next().charAt(0); } return Array; } char [][] CharArray(int n , int m) { final char [][] Array = new char [n][m]; for(int i = 0 ; i < n ; i ++ ) { Array[i] = next().toCharArray(); } return Array; } }