<?php
$box = trim(fgets(STDIN));
$num = trim(fgets(STDIN));
$blocks = explode(" ", (trim(fgets(STDIN))));

sort($blocks);
$ans;$totalBlockSize = 0;
for ($i=0; $box >= $totalBlockSize; $i++) {
    $totalBlockSize += $blocks[$i];
}
$ans = $i - 1;
echo $ans."\n";