#include<iostream>
#include<vector>
#include<algorithm>
using namespace std;

int main()
{
    int a,b,c;
    int sum = 0;
    int cnt = 0;
    vector<int> boxes;
    cin >> a >> b;
    
    for (int i=0; i<b; ++i) {
        cin >> c;
        boxes.push_back(c);
    }
    
    sort(boxes.begin(), boxes.end());
    for (int i=0; i<boxes.size(); ++i) {
        a -= boxes[i];
        if (a >= 0) {
            ++cnt;
        }else{
            break;
        }
    }
    
    cout << cnt << endl;
    
    return 0;
}