#define _GLIBCXX_DEBUG
#define ll long long
#include <bits/stdc++.h>
using namespace std;
using Graph = vector<vector<int>>;

void print(auto a){
  cout << a;
}

void printL(auto a){
  cout << a << endl;
}

void L(){
  cout << endl;
}

void jud(int i, int l, vector<int> A){
  if(l < 0){
    cout << i-1 << endl;
    return;
  }
  if(i == (int)A.size()){
    cout << i << endl;
    return;
  }
  jud(i+1, l-A[i], A);
}

int main(){
  int L, N; cin >> L >> N;
  vector<int> A(N);
  for(int i = 0; i < N; i++){
    cin >> A[i];
  }
  sort(A.begin(), A.end());
  jud(0, L, A);
}