Find the sum of the digits of a given number ?

import java.util.*;

public class Main
{
public static void main(String[] args)
{
Scanner s=new Scanner(System.in);
int n=s.nextInt();
int sum=0;
while(n>0)
{
int r=n%10;
sum=sum+r;
n=n/10;
}
System.out.print(sum);
}
}