320A.java

//https://codeforces.com/problemset/problem/320/A

import java.io.*;
import java.util.*;
import java.io.BufferedReader; 
import java.io.IOException; 
import java.io.InputStreamReader; 
// import java.util.Scanner; 
import java.util.StringTokenizer; 
  
public class magic
{ 
    static class FastReader 
    { 
        BufferedReader br; 
        StringTokenizer st; 
  
        public FastReader() 
        { 
            br = new BufferedReader(new
                     InputStreamReader(System.in)); 
        } 
  
        String next() 
        { 
            while (st == null || !st.hasMoreElements()) 
            { 
                try
                { 
                    st = new StringTokenizer(br.readLine()); 
                } 
                catch (IOException  e) 
                { 
                    e.printStackTrace(); 
                } 
            } 
            return st.nextToken(); 
        } 
  
        int nextInt() 
        { 
            return Integer.parseInt(next()); 
        } 
  
        long nextLong() 
        { 
            return Long.parseLong(next()); 
        } 
  
        double nextDouble() 
        { 
            return Double.parseDouble(next()); 
        } 
  
        String nextLine() 
        { 
            String str = ""; 
            try
            { 
                str = br.readLine(); 
            } 
            catch (IOException e) 
            { 
                e.printStackTrace(); 
            } 
            return str; 
        } 
    } 
  
    public static void main(String[] args) 
    { 
        FastReader s=new FastReader(); 
        long n = s.nextLong();
        String str=n+"";
        int f=0;
        for (int i = 0; i < str.length(); i++) {
            if(str.charAt(i)!='1' && str.charAt(i)!='4'){
                f=1;
                System.out.println("NO");
                break;
            }
            else if(str.charAt(0)!='1'){
                f=1;
                System.out.println("NO");
                break;
            }
            else if(str.contains("444")){
                f=1;
                System.out.println("NO");
                break;
            }
        }
        if(f==0)System.out.println("YES");
    }
}