<?php

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

    $sum = 0;
    for ($i = 0; $i < (integer)$n; $i++) {
    	$sum += $w[$i];
    	if ($sum > (integer)$l) break;
    }

    echo $i . "\n";