<?php

$all = trim(fgets(STDIN));

$num = trim(fgets(STDIN));

$numAll = trim(fgets(STDIN));

$num_all = explode(" ", $numAll);

sort($num_all);

$answer = 0;
$count = 0;

foreach($num_all as $key => $value){
    $answer += $value;
    if($answer <= $all){
        $count ++;
    }
}

echo $count;

echo "\n";