#include <bits/stdc++.h>
#define rep(i,n) for(int i = 0; i < (n); i++)
using namespace std;
typedef long long ll;
#define chmin(x,y) x = min(x,y)

int main(){
    cin.tie(0);
    ios::sync_with_stdio(0);

    ll L,N; cin >> L >> N;
    ll W[N]; rep(i,N) cin >> W[i];
    sort(W, W + N);
    ll now = 0, c = 0;
    rep(i,N){
        if(now < L) now += W[i], c++;
        else break;
    }

    if(now == L){
        cout << c << '\n';
    }else{
        cout << c-1 << '\n';
    }
}