import java.io.*;
import java.util.*;

interface divSum {
    int divisor_sum(int n);
}

class AdvancedArithmetic {
    int divisor_sum(int n){
        int sum = 0;
        for(int i=1; i<=n; i++) {
            if(n%i==0)
                sum = sum + i;
        }
        return(sum);
    }
}

public class Solution {
    
    public static void main(String[] args) {
        /* Enter your code here. Read input from STDIN. Print output to STDOUT. Your class should be named Solution. */
        Scanner sc = new Scanner(System.in);
        int n = sc.nextInt();
        AdvancedArithmetic a = new AdvancedArithmetic();
        int ans = a.divisor_sum(n);
        System.out.println("I implemented: "+a.getClass().getName());
        System.out.print(ans);
    }
}