#include <bits/stdc++.h>
using namespace std;
int main(){
  long long a,b,k[10005],sum;
cin>>a>>b;
for(int i=0;i<b;++i){cin>>k[i];}
sort(k,k+b);
  if(k[0]>a){
    cout<<0<<endl;
            return 0;}
for(int i=0;i<a;++i){
  sum+=k[i];
if(sum>a){
cout<<i-1<<endl;
return 0;
}
}
  cout<<b<<endl;
}