<?php
$L = trim(fgets(STDIN));
$N = trim(fgets(STDIN));
$lengths = explode(" ", trim(fgets(STDIN)));

sort($lengths);

$num = 0;
$total = 0;
foreach($lengths as $l) {
	$total += $l;
	if ($total > $L) {
		break;
	} else {
		$num++;
	}
}

echo $num . "\n";