#include <bits/stdc++.h>
#include <atcoder/all>
using namespace std;
using namespace atcoder;
using ll = long long;
using ld = long double;

int N, K, P[200], ans;

int main() {
  cin >> N >> K;
  for (int i = 0; i < N; i++) cin >> P[i];
  for(int i = 0; i <= 401; i++) {
    int cnt = 0;
    for (int j = 0; j < N; j++) {
      if (i <= P[j]) cnt++; 
    }
    if (cnt <= K) ans = max(cnt, ans);
  }
  cout << ans << endl;
  return 0;
}