use strict;

my $N = <STDIN>;
my @list;
for (my $i = 0; $i < $N; $i++)
{
	my $str = <STDIN>;
	push(@list, $str);
}
sort(@list);
my $cnt = 0;
my $cnt_max = 0;
my $res = @list[0];
foreach my $i(@list)
{
	if($i != $res)
	{
		$cnt = 0;
	}
	$cnt++;
	$res = $i;
	if($cnt > $cnt_max)
	{
		$cnt_max = $cnt;
	}
}
if($cnt_max > @list / 2)
{
	print "NO\n";
}
else
{
	print "YES\n";
}