<?php

/**
 * No.5 数字のブロック
 * 
 * @see https://yukicoder.me/problems/14
 */

$widthOfBigBox = trim(fgets(STDIN));
$numOfBlocks = trim(fgets(STDIN));
$widthSetOfBlocks = explode(" ", trim(fgets(STDIN)));

sort($widthSetOfBlocks);
$sum = 0;
$countBlock = 0;
for ($i = 0; $i < count($widthSetOfBlocks); $i++) {
    if (($sum += $widthSetOfBlocks[$i]) > $widthOfBigBox) {
        break;
    }
    $countBlock++;
}
echo $countBlock . "\n";