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

public class Main {
    public static void main(String[] args) {
        try (Scanner scan = new Scanner(System.in)) {
            int N = scan.nextInt();
            HashMap<String, Integer> map = new HashMap<>();
            for(int i=0; i<N; i++) {
                String key = scan.next();
                Integer value = map.get(key);
                if(value == null) {
                    map.put(key, 1);
                } else {
                    map.replace(key, value+1);
                }                
            }
            
            ArrayList<Integer> array = new ArrayList<>();
            for(Entry entry : map.entrySet()) {
                array.add((Integer)entry.getValue());
            }
                        
            while(true) {
                
                if(array.size() == 1) {
                    System.out.println("NO");
                    break;
                }
                
                int max = 0;
                int index = 0;
                int zeroCount = 0;
                for(int i=0; i<array.size(); i++) {
                    Integer v = array.get(i);
                    if(v == 0) {
                        zeroCount++;
                    }
                    
                    if( max < v ) {
                        max = v;
                        index = i;
                    }
                }
                
                if(zeroCount == array.size()) {
                    System.out.println("YES");
                    break;
                }
                if(zeroCount == array.size()-1) {
                    if(max == 1) {
                        System.out.println("YES");
                    } else {
                        System.out.println("NO");
                    }
                    break;
                }
                
                int sum = 0;
                int rem = max;
                if(rem % 2 == 1) {
                    rem--;
                }
                
                for(int i=0; i<array.size(); i++) {
                    if(i == index) continue;
                    Integer v = array.get(i);
                    if(v == 0) continue;
                    sum += v;
                    if(rem > sum) {
                        array.set(i, 0);
                        int t = array.get(index);
                        array.set(index, t-v);
                    } else {
                        array.set(i, sum-rem);
                        array.set(index, 0);
                        break;
                    }
                }
            } 
        }
    }
}