MODE = "stdio"

tmp = Array.new




if(defined? MODE)
  tmp = STDIN.read.split("\n")
else
  iotmp = "\
  19
  ne
  ushi
  tora
  u
  tatsu
  mi
  uma
  hitsuji
  saru
  tori
  inu
  inu
  inu
  i
  ".split("\n")
  iotmp.each{|s|
    tmp << s.strip
  }
end

N = tmp[0].to_i

okimono = Hash.new(0)
(1..N).each do |n|
  okimono[tmp[n]]+=1
end
okimono = okimono.sort_by{|k,v| -v}
if okimono.shift[1] <= (N/2).ceil
  puts "YES"
else
  puts "NO"
end