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

using namespace std;

int main() {


  int l,n;
  cin >> l;
  cin >> n;
  vector<int> v;
  int i;
  for ( i = 1; i <= n; i++) {
    int a;
    cin >> a;
    v.push_back(a);
  }
  //printf("%d\n", v[0]);
  //vにWが入る

  sort(v.begin(),v.end());
  //昇順
  //printf("%d\n", v[0]);
  int j;
  int sum = 0;
  for (j = 0; j < n; j++) {
    sum += v[j];
    if (sum >= l) {
      cout << j << endl;
      break;
    }
  }
}