$box_width = trim(fgets(STDIN));
$block_num = trim(fgets(STDIN));
$block_width_array = explode(" ", fgets(STDIN));
$block_width_array = str_replace(array("\r\n", "\r", "\n"), "", $block_width_array);
//echo $box_width."\n";
//echo $block_num."\n";
//print_r($block_width_array);
sort($block_width_array);
//print_r($block_width_array);
$result = 0;
$count = 0;
for($i=0; $i<$block_num; $i++){
    $result += $block_width_array[$i];
    if($result > $box_width){
        break;
    }
    $count++;
}
echo $count;