<?php
$input = trim(fgets(STDIN));

$a = trim(fgets(STDIN));
$b = explode(" ", trim(fgets(STDIN)));
$c = 0;

sort($b);

foreach($b as $row) {
	if($input >= $row) {
		$input -= $row;
		$c++;
	} else {
		break;
	}
}
echo $c;


?>