a = []
n = gets.to_i
n.times do
  a += [gets.chomp!]
end
hash = a.inject(Hash.new(0)){|h, a| h[a] += 1; h}
hash = hash.sort
if  hash[0][1].to_i > (n/2 + 1)
  puts "NO"
else
  puts "YES"
end