<?php
$box_length = trim(fgets(STDIN));
$block_num = trim(fgets(STDIN));
$block = trim(fgets(STDIN));

$block_arr = explode(" ", $block);
sort($block_arr);

$total =0;
for ($i = 0; $i < $block_num; $i++)
{
    $total += $block_arr[$i];
    if ($total > $box_length)
    {
        break;
    }
}
echo $i."\n";