#include <bits/stdc++.h>
#define rep(i,n) for(int i=0;i<(int)(n);i++)
#define rep1(i,n) for(int i=1;i<=(int)(n);i++)
#define all(c) c.begin(),c.end()
#define pb push_back
#define fs first
#define sc second
#define show(x) cout << #x << " = " << x << endl
#define chmin(x,y) x=min(x,y)
#define chmax(x,y) x=max(x,y)
using namespace std;
vector<int> d;
int main(){
	int a,b;
	cin>>a>>b;
	rep(i,b){
		int c;
		cin>>c;
		d.pb(c);
	}
	sort(all(d));
	int e=0;
	rep(i,b){
		a-=d[i];
		if(a<0) break;
		e++;
	}
	cout<<e<<endl;
}