<?php

$total = trim(fgets(STDIN));
$x = trim(fgets(STDIN));
$width = explode(" ", trim(fgets(STDIN)));

sort($width);

$sum   = 0;
$count = 0;

for ($w=0; $w<count($width); $w++){
	$sum += $width[$w];
	
	if ($total>=$sum){
		$count++;
	}else{
		break;
	}
}

echo $count . "\n";