#include <bits/stdc++.h>

using namespace std;

typedef long long ll;
ll x[500005];

int main(){
    ll n, m;
    cin >> m >> n;
    for(int i=0;i<n;i++){
        cin >> x[i];
    }
    sort(x, x + n);
    ll cnt = 0;
    ll sum = 0;
    for(int i=0;i<n;i++){
        sum += x[i];
        if(sum <= m)cnt ++;
    }
    cout << cnt << endl;
    return 0;
}