#include <iostream>
#include <algorithm>
#include <vector>
#include <numeric>

using namespace std;

int main(){
  int l, n, i, w, count;
  vector<int> w_v;
  cin >> l >> n;
  for (i = 0;i<n;i++){
    cin >> w;
    w_v.push_back(w);
  }
  sort(w_v.begin(),w_v.end());
  i = 0;
  while(true){
    if (w_v[i] >= l){
      break;
    }
    l = l - w_v[i];
    count++;
    i++;
  }
  cout << count << endl;
}