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

int main()
{
    int l, n, num;
    int all = 0;
    int cnt = 0;
    vector<int> data;

    cin >> l >> n;
    for(int i=0; i<n; i++){
        cin >> num;
        data.push_back(num);
    }
    sort(data.begin(), data.end());
    for(vector<int>::iterator it = data.begin(); it != data.end() && all<l ; it++){
        all += *it;
        cnt++;
    }
    cout << cnt << endl;
    return 0;
}