#include <bits/stdc++.h>
using namespace std;
int main(){
  int N, M;
  cin >> N >> M;
  vector<int> C(N);
  for (int i = 0; i < N; i++){
    cin >> C[i];
  }
  for (int i = 0; i < M; i++){
    (*min_element(C.begin(), C.end()))--;
  }
  int ans = 0;
  for (int i = 0; i < M; i++){
    if (C[i] == 0){
      ans++;
    }
  }
  cout << ans << endl;
}