#include<bits/stdc++.h>
using namespace std;
using ll = long long;
using vll = vector<ll>;
using vvll = vector<vll>;
#define rep(i,n) for(ll i=(ll)(0); i<(ll(n)); ++i)
#define all(x) (x).begin(), (x).end()


int main() {

   ll N,K;
   cin>>N>>K;
   vll A(N+1,0);
   rep(i,N){
    ll a;
    cin>>a;
    A[a]++;
   }
   sort(all(A));
   reverse(all(A));
   rep(i,N){
    K-=A[i];
    if(K<=0){
        cout<<i+1<<endl;
        return 0;
    }
   }
}