import java.util.Scanner;

public  class Main{
	public static void main(String[] args){
	Scanner stdIn = new Scanner(System.in);
	String n = stdIn.next();
	int ans = 0;
	for(int i=0;i<n.length();i++){
		ans+= n.charAt(i)-'0';
	}
if(ans%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 stdIn = new Scanner(System.in);
	String n = stdIn.next();
	int ans = 0;
	for(int i=0;i<n.length();i++){
		ans+= n.charAt(i)-'0';
	}
if(ans%9==0){
System.out.println("Yes");
}
else {
System.out.println("No");
}

}
} Main public static void main(String[] args){
	Scanner stdIn = new Scanner(System.in);
	String n = stdIn.next();
	int ans = 0;
	for(int i=0;i<n.length();i++){
		ans+= n.charAt(i)-'0';
	}
if(ans%9==0){
System.out.println("Yes");
}
else {
System.out.println("No");
}

} main {
	Scanner stdIn = new Scanner(System.in);
	String n = stdIn.next();
	int ans = 0;
	for(int i=0;i<n.length();i++){
		ans+= n.charAt(i)-'0';
	}
if(ans%9==0){
System.out.println("Yes");
}
else {
System.out.println("No");
}

} Scanner stdIn = new Scanner(System.in); stdIn new Scanner(System.in) String n = stdIn.next(); n stdIn.next() stdIn.next stdIn int ans = 0; ans 0 for(int i=0;i<n.length();i++){
		ans+= n.charAt(i)-'0';
	} int i=0; int i=0; i 0 i<n.length() i n.length() n.length n i++ i++ i {
		ans+= n.charAt(i)-'0';
	} {
		ans+= n.charAt(i)-'0';
	} ans+= n.charAt(i)-'0' ans n.charAt(i)-'0' n.charAt(i) n.charAt n i '0' if(ans%9==0){
System.out.println("Yes");
}
else {
System.out.println("No");
} ans%9==0 ans%9 ans 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 stdIn = new Scanner(System.in);
	String n = stdIn.next();
	int ans = 0;
	for(int i=0;i<n.length();i++){
		ans+= n.charAt(i)-'0';
	}
if(ans%9==0){
System.out.println("Yes");
}
else {
System.out.println("No");
}

}
} public  class Main{
	public static void main(String[] args){
	Scanner stdIn = new Scanner(System.in);
	String n = stdIn.next();
	int ans = 0;
	for(int i=0;i<n.length();i++){
		ans+= n.charAt(i)-'0';
	}
if(ans%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 stdIn = new Scanner(System.in);
	String n = stdIn.next();
	int ans = 0;
	for(int i=0;i<n.length();i++){
		ans+= n.charAt(i)-'0';
	}
if(ans%9==0){
System.out.println("Yes");
}
else {
System.out.println("No");
}

}
}