<?php
    $l = trim(fgets(STDIN));
    $n = trim(fgets(STDIN));
    $w = explode(" ", trim(fgets(STDIN)));
    sort($w);
    $out = 0;
    $width = 0;

    for($i = 0; $i < $n; $i++){
        $width += $w[$i];
        $out++;
        if($width >= $l){
            break;
        }
    }
    echo $out."\n";