#include<iostream>
#include<vector>
#include<algorithm>

using namespace std;

int main(){
    int n,l;
    cin >> n >> l;
    vector<int> b;
    for(int i=0;i < l;i++){
        int input; cin >> input;
        b.push_back(input);
    }
    sort(b.begin(),b.end());
    int ans = 0;
    int sum = 0;
    for(int i=0;sum <= n;i++){
        sum += b[i];
        if(sum <= n) ans++;
    }
    cout << ans << endl;
}