#include<bits/stdc++.h>
using namespace std;
int main() {
    int n, k;
    cin >> n >> k;
    vector<int> cnt(100100);
    for (int i = 0; i < n; ++i) {
        int a;
        cin >> a;
        cnt[a]++;
    }
    sort(cnt.rbegin(), cnt.rend());
    for (int i = 0; i < n; ++i) {
        k -= cnt[i];
        if (k <= 0) {
            cout << i + 1 << endl;
            return 0;
        }
    }
}