n = gets.not_nil!.to_i

counter = Hash(String, Int32).new(0)
n.times do
  a = gets.not_nil!.chomp
  counter[a] = counter[a] + 1
end

max = 0
counter.each do |k, v|
  max = [max, v].max
end

if max > (n + 1) / 2
  puts "NO"
else
  puts "YES"
end