use warnings;

my $l = <>;
my $n =<>;
my $str = <>;
chomp $str;
my @array = split / /, $str;
my $ans = 0;
my $count = 0;
@array = sort {$a <=> $b} @array;

for(my $i = 0; $i < $n; $i++) {
	$count += $array[$i];
	if($count < $l) {
		$ans++;
	} else {
		last;
	}
}

print "$ans\n";