#include <bits/stdc++.h>
using namespace std;
#include <atcoder/all>
using namespace atcoder;
#define rep(i, n) for(int i=0;i<(n);++i)
#define rep1(i, n) for(int i=1;i<=(n);i++)
#define ll long long
using mint = modint998244353;
using P = pair<ll,ll>;
using lb = long double;
using T = tuple<ll, ll, ll>;
#ifdef LOCAL
#  include <debug_print.hpp>
#  define dbg(...) debug_print::multi_print(#__VA_ARGS__, __VA_ARGS__)
#else
#  define dbg(...) (static_cast<void>(0))
#endif

int main()
{
    int n, k;
    cin >> n >> k;
    vector<int> a(n);
    rep(i,n){
        int b;
        cin >> b;
        --b;
        a[b]++;
    }
    sort(a.rbegin(),a.rend());
    int now = 0;
    rep(i,n){
        now += a[i];
        if(now>=k){
            cout<<i+1<<endl;
            return 0;
        }
    }
    return 0;
}