#ifndef LOCAL
#include <bits/stdc++.h>

using namespace std;

#define debug(...) (void(0))
#else
#include "algo/debug.h"
#endif

void solve() {
    int N, K; cin >> N >> K;
    vector<int> A(N);
    vector<int> freq(N);
    for(int i = 0; i < N; i++) {
        cin >> A[i], A[i]--;
        freq[A[i]]++;
    }
    sort(freq.rbegin(), freq.rend());
    int sum = 0;
    int id = 0;
    while(sum < K) {
        sum += freq[id++];
    }
    cout << id << endl;

}

int main() {
    std::ios::sync_with_stdio(false);
    std::cin.tie(nullptr);
    int tt = 1;
    // std::cin >> tt;
    while(tt--) {
        solve();
    }
}