<?php
// Here your code !
$L = trim(fgets(STDIN));
$N = trim(fgets(STDIN));
$boxes = explode(' ',trim(fgets(STDIN)));
sort($boxes);
$len = 0;
foreach($boxes as $i => $box) {
    if($L < ($len + $box)) {
        echo $i.PHP_EOL;
        break;
    } else if ($L == ($len + $box)) {
        echo ($i+1).PHP_EOL;
    } else {
        $len += $box;
    }
}