<?php
$l = trim(fgets(STDIN));
$n = trim(fgets(STDIN));
$w = explode(" ", trim(fgets(STDIN)));
sort($w);

$sum = 0;
for($i = 0; $i < $n; $i++){
	$sum += $w[$i];
	if($sum > $l){
		break;
	}
}
echo $i. "\n";