import java.util.HashMap;
import java.util.Map;
import java.util.Map.Entry;
import java.util.Scanner;


public class Main_yukicoder349 {

    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);

        int n = sc.nextInt();

        Map<String, Integer> hm = new HashMap<>();
        for (int i = 0; i < n; i++) {
        	String s = sc.next();
        	if (hm.containsKey(s)) {
        		hm.put(s, hm.get(s) + 1);
        	} else {
        		hm.put(s, 1);
        	}
        }

        boolean flag = true;
        for (Entry<String, Integer> e : hm.entrySet()) {
        	if (e.getValue() -1 > n - e.getValue()) {
        		flag = false;
        		break;
        	}
        }

        if (flag) {
        	System.out.println("YES");
        } else {
        	System.out.println("NO");
        }

        sc.close();
    }
}