package main

import . "fmt"

func main() {
	var n int
	Scan(&n)
	m := map[string]int{}
	max := 0
	for i:=0;i<n;i++ {
		var a string
		Scan(&a)
		m[a]++
		if m[a]>max {
			max =m[a]
		}
	}
	if max>(n+1)/2 {
		Println("NO")
	} else {
		Println("YES")
	}
}