<?php

    $l = trim(fgets(STDIN));
    $n =trim(fgets(STDIN));
    $w = explode(' ', trim(fgets(STDIN)));
    asort($w);

    $count = 0;
    $sum = 0;
    foreach ($w as $val) {
    	$sum += $val;
    	if ($sum > (integer)$l || $count >= (integer)$n) break;
    	$count++;
    }

    echo $count . "\n";