<?php
$boxSize=trim(fgets(STDIN));
$blockNum=trim(fgets(STDIN));
$blocks=explode(" ",trim(fgets(STDIN)));

$sum=0;
$num=0;

sort($blocks);
//var_dump($blocks);

//var_dump((int)$blocks[0]);

while($boxSize>=$sum){
    $sum+=$blocks[$num];
    $num++;
}

echo ($num-1);


?>