chomp(my $width = <STDIN>);
$width = int($width);
<STDIN>;
chomp(my $array = <STDIN>);
my $cnt = 0; my $total = 0;
foreach (sort {$a <=> $b} split(/\s/, $array)) {
    $total += int($_);
    last if ($total > $width);
    $cnt++;
}
print $cnt."\n";