n=gets.to_i #number of animals
a=$stdin.read.split(?\n).map().sort #array of animals

a.each {|str|
  m=(m>a.count(str)? m:a.count(str))
  }

flag = 0

if n%2==0
  if m<=n/2
    flag=1
  end
else
  if m<=(n+1)/2
    flag=1
  end
end

if flag==1
  puts "YES"
elsif flag==0
  puts"NO"
end