#include<bits/stdc++.h>

#define rep(i, n) for (int i = 0; i < (int) n; i++)

using ll = long long;
using namespace std;

const long long INF = 1ll << 60;

template<class T>
bool chmin(T &a, T b) {
    if (a > b) {
        a = b;
        return true;
    }
    return false;
}

template<class T>
bool chmax(T &a, T b) {
    if (a < b) {
        a = b;
        return true;
    }
    return false;
}


int main() {
    ll n, k;
    cin >> n >> k;
    vector<ll> v(n);
    rep(i, n) cin >> v[i];
    sort(v.rbegin(), v.rend());
    
    ll ans = 0;
    rep(j, 401) {
        ll cnt = 0;
        rep(i, n) cnt += (v[i] >= j);
        
        if (cnt <= k) chmax(ans, cnt);
    }
    
    cout << ans << endl;
}