#include <bits/stdc++.h>
#include <iostream>
using namespace std;
#pragma GCC optimize("Ofast")
#pragma GCC target("sse,sse2,sse3,ssse3,sse4,popcnt,abm,mmx,avx,tune=native")
#define rep(i,a,b) for(LL i = a;i<b; i++)
#define rrep(i,a,b) for(LL i = a;i>b; i--)
#define tobirep(i,a,b,c) for(LL i = a;i<b; i+=c)
#define tobirrep(i,a,b,c) for(LL i = a;i>b; i-=c)
#define INF ((1LL<<62)-(1LL<<31))
#define ooki 9223372036854775807
#define tii -9223372036854775808
typedef long long LL;
int main(){  
 ios::sync_with_stdio(0);cin.tie(nullptr);
  LL l,n,sum=0,i=0;
  cin >> l >> n;
  vector<LL> a(n);
  rep(i,0,n){cin >> a[i];}
  sort(a.begin(),a.end());
  while(sum<=l){
    sum+=a[i];
    i++;
    
  }
  if(sum==l){i--;}
  cout << i-1 << endl;
    
}