import java.util.*;
import static java.lang.System.*;

public class Main {
	static Scanner sc = new Scanner(System.in);
	public static void main(String[] args) {
		int n = sc.nextInt();
		Map<String,Integer> map = new LinkedHashMap<>();
		String s;
		for (int i=0; i<n; i++) {
			s = sc.next();
			map.put(s,map.getOrDefault(s,0));
			map.put(s,map.get(s)+1);
		}
		int max = -1;
		for (Map.Entry<String,Integer> entry : map.entrySet()) {
			max = Math.max(max,entry.getValue());
		}
		if (max < (n+1)/2) {out.println("YES");}
		else {out.println("NO");}
	}
}