import java.io.IOException;
import java.io.InputStream;
import java.io.PrintWriter;
import java.util.*;

public class Main {
	static final int INF = 2 << 28;
	static final long INF_L = 2L << 60;
	static final int  MOD = 1000000007;
	static final long MOD_L = 1000000007L;
	static final int[] vx_4 = {1,0,-1,0};
	static final int[] vy_4 = {0,1,0,-1};
	static final int[] vx_5 = {1,0,-1,0,0};
	static final int[] vy_5 = {0,1,0,-1,0};
	static final int[] vx_8 = {1,1,1,0,0,-1,-1,-1};
	static final int[] vy_8 = {1,0,-1,1,-1,1,0,-1};
	static final int[] vx_9 = {1,1,1,0,0,0,-1,-1,-1};
	static final int[] vy_9 = {1,0,-1,1,0,-1,1,0,-1};
	
	public static void main(String[] args) {	
		FastScanner sc = new FastScanner();
		PrintWriter out = new PrintWriter(System.out);
		int N = sc.nextInt();
		int[] count = new int[12];
		int kk = 0;
		HashMap<String,Integer> map = new HashMap<String,Integer>();
		for(int i = 0; i < N; i++) {
			String in = sc.next();
			if(map.containsKey(in)) {
				count[map.get(in)]++;
			}
			else {
				map.put(in, kk);
				count[kk++]++;
			}
		}
		PriorityQueue<Data> q = new PriorityQueue<Data>();
		for(int i = 0; i < kk; i++) {
			q.add(new Data(i,count[i]));
		}
		boolean ok = true;
		int pre = -1;
		while(!q.isEmpty()) {
			if(q.size() == 1 && pre == q.peek().type) {
				ok = false;
				break;
			}
			else if(pre == q.peek().type) {
				Data tmp = q.poll();
				Data tmp2 = q.poll();
				tmp2.count--;
				pre = tmp2.type;
				q.add(tmp);
				if(tmp2.count != 0) q.add(tmp2);
			}
			else {
				Data tmp = q.poll();
				tmp.count--;
				pre = tmp.type;
				if(tmp.count != 0) q.add(tmp);
			}
		}
		if(ok)System.out.println("YES");
		else System.out.println("NO");
	}
	static class Data implements Comparable<Data> {
		int type;
		int count;
		Data(int a, int b) {
			type = a;
			count = b;
		}
		@Override
		public int compareTo(Data o) {
			return this.count - o.count;
		}
	}
}

class FastScanner {
    private final InputStream in = System.in;
    private final byte[] buffer = new byte[1024];
    private int ptr = 0;
    private int buflen = 0;
    private boolean hasNextByte() {
        if (ptr < buflen) {
            return true;
        }else{
            ptr = 0;
            try {
                buflen = in.read(buffer);
            } catch (IOException e) {
                e.printStackTrace();
            }
            if (buflen <= 0) {
                return false;
            }
        }
        return true;
    }
    private int readByte() { if (hasNextByte()) return buffer[ptr++]; else return -1;}
    private static boolean isPrintableChar(int c) { return 33 <= c && c <= 126;}
    private void skipUnprintable() { while(hasNextByte() && !isPrintableChar(buffer[ptr])) ptr++;}
    public boolean hasNext() { skipUnprintable(); return hasNextByte();}
    public String next() {
        if (!hasNext()) throw new NoSuchElementException();
        StringBuilder sb = new StringBuilder();
        int b = readByte();
        while(isPrintableChar(b)) {
            sb.appendCodePoint(b);
            b = readByte();
        }
        return sb.toString();
    }
    public long nextLong() {
        if (!hasNext()) throw new NoSuchElementException();
        long n = 0;
        boolean minus = false;
        int b = readByte();
        if (b == '-') {
            minus = true;
            b = readByte();
        }
        if (b < '0' || '9' < b) {
            throw new NumberFormatException();
        }
        while(true){
            if ('0' <= b && b <= '9') {
                n *= 10;
                n += b - '0';
            }else if(b == -1 || !isPrintableChar(b)){
                return minus ? -n : n;
            }else{
                throw new NumberFormatException();
            }
            b = readByte();
        }
    }
    public int nextInt() {
    	if (!hasNext()) throw new NoSuchElementException();
        int n = 0;
        boolean minus = false;
        int b = readByte();
        if (b == '-') {
            minus = true;
            b = readByte();
        }
        if (b < '0' || '9' < b) {
            throw new NumberFormatException();
        }
        while(true){
            if ('0' <= b && b <= '9') {
                n *= 10;
                n += b - '0';
            }else if(b == -1 || !isPrintableChar(b)){
                return minus ? -n : n;
            }else{
                throw new NumberFormatException();
            }
            b = readByte();
        }
    }
}