<?php
// Your code here!

    $all_length = trim(fgets(STDIN));
    $num = trim(fgets(STDIN));
    $length_arr = explode(" ",trim(fgets(STDIN)));
    sort($length_arr);
    
    $ct = 0;
    for($i = 0; $i < count($length_arr); $i++) {
        if ($all_length - $length_arr[$i] >= 0) {
            $all_length -= $length_arr[$i];
            $ct++;
        }
    }
    
    echo $ct;

?>