object Main {
  def main(args: Array[String]): Unit = {
    val n = readInt()
    val count = scala.collection.mutable.HashMap.empty[String, Int]
    for (_ <- 1 to n) {
      val s = readLine()
      if (!(count contains s)) count += (s -> 0)
      count(s) += 1
    }
    println {
      if (count.values.max > (n + 1) / 2) "NO"
      else "YES"
    }
  }
}