public class Solution {
    public static void main(String[] args) {
        System.out.println(sumDigitsInNumber(546));
    }

    public static int sumDigitsInNumber(int number) {
        int n = number;
        int s = 0;
        for(int i = n; i>0; i/=10) {
            s += i % 10;
        }
        return s;