import java.util.Scanner;
public class Main {
    public static void main(String[] args){
    
    Scanner sc = new Scanner(System.in);
    String S  = sc.next();
    char[]ss = S.toCharArray();
    
    int all = 0;
    for(int i=0; i<S.length(); i++) {
    	all += ss[i]-48;
    }	
    	if(all%9 == 0) {
    		System.out.println("Yes");
    	}else {
    		System.out.println("No");
    }
}
} import java.util.Scanner; Scanner java.util public class Main {
    public static void main(String[] args){
    
    Scanner sc = new Scanner(System.in);
    String S  = sc.next();
    char[]ss = S.toCharArray();
    
    int all = 0;
    for(int i=0; i<S.length(); i++) {
    	all += ss[i]-48;
    }	
    	if(all%9 == 0) {
    		System.out.println("Yes");
    	}else {
    		System.out.println("No");
    }
}
} Main public static void main(String[] args){
    
    Scanner sc = new Scanner(System.in);
    String S  = sc.next();
    char[]ss = S.toCharArray();
    
    int all = 0;
    for(int i=0; i<S.length(); i++) {
    	all += ss[i]-48;
    }	
    	if(all%9 == 0) {
    		System.out.println("Yes");
    	}else {
    		System.out.println("No");
    }
} main {
    
    Scanner sc = new Scanner(System.in);
    String S  = sc.next();
    char[]ss = S.toCharArray();
    
    int all = 0;
    for(int i=0; i<S.length(); i++) {
    	all += ss[i]-48;
    }	
    	if(all%9 == 0) {
    		System.out.println("Yes");
    	}else {
    		System.out.println("No");
    }
} Scanner sc = new Scanner(System.in); sc new Scanner(System.in) String S  = sc.next(); S sc.next() sc.next sc char[]ss = S.toCharArray(); ss S.toCharArray() S.toCharArray S int all = 0; all 0 for(int i=0; i<S.length(); i++) {
    	all += ss[i]-48;
    } int i=0; int i=0; i 0 i<S.length() i S.length() S.length S i++ i++ i {
    	all += ss[i]-48;
    } {
    	all += ss[i]-48;
    } all += ss[i]-48 all ss[i]-48 ss[i] ss i 48 if(all%9 == 0) {
    		System.out.println("Yes");
    	}else {
    		System.out.println("No");
    } all%9 == 0 all%9 all 9 0 {
    		System.out.println("Yes");
    	} System.out.println("Yes") System.out.println System.out System System.out "Yes" {
    		System.out.println("No");
    } System.out.println("No") System.out.println System.out System System.out "No" String[] args args public class Main {
    public static void main(String[] args){
    
    Scanner sc = new Scanner(System.in);
    String S  = sc.next();
    char[]ss = S.toCharArray();
    
    int all = 0;
    for(int i=0; i<S.length(); i++) {
    	all += ss[i]-48;
    }	
    	if(all%9 == 0) {
    		System.out.println("Yes");
    	}else {
    		System.out.println("No");
    }
}
} public class Main {
    public static void main(String[] args){
    
    Scanner sc = new Scanner(System.in);
    String S  = sc.next();
    char[]ss = S.toCharArray();
    
    int all = 0;
    for(int i=0; i<S.length(); i++) {
    	all += ss[i]-48;
    }	
    	if(all%9 == 0) {
    		System.out.println("Yes");
    	}else {
    		System.out.println("No");
    }
}
} Main
import java.util.Scanner;
public class Main {
    public static void main(String[] args){
    
    Scanner sc = new Scanner(System.in);
    String S  = sc.next();
    char[]ss = S.toCharArray();
    
    int all = 0;
    for(int i=0; i<S.length(); i++) {
    	all += ss[i]-48;
    }	
    	if(all%9 == 0) {
    		System.out.println("Yes");
    	}else {
    		System.out.println("No");
    }
}
}