import java.util.HashMap;
import java.util.Scanner;

public class Main {

	public static void main (String[] args) {

		Scanner sc = new Scanner(System.in);

		int n = sc.nextInt();
		HashMap<String, Integer> list = new HashMap<String, Integer>();
		for (int i = 0; i < n; i++) {
			String s = sc.next();
			if (list.containsKey(s)) {
				//System.out.println("あるｎ");
				list.put(s, list.get(s) + 1);
			} else {
				//System.out.println("ないｎ");
				list.put(s, 1);
			}
		}
		sc.close();

		System.out.println(solve(list, (n + 1) / 2) ? "YES" : "NO");
	}

	public static boolean solve (HashMap<String,Integer> list, int lim) {
		for (String s : list.keySet()) {
			//System.out.println(list.get("saru") + " , " + lim);
			if (list.get(s) > lim) return false;
		}
		return true;
	}

}