import java.util.Scanner;

public class Solution {
    public static void main(String[] args) {
        try(Scanner in = new Scanner(System.in)) {
            int N = in.nextInt();
            int sum = 1;
            for(int i = 2; i * i <= N; i++) {
                if((N % i) == 0) {
                    sum += i;
                    int otherDiv = N / i;
                    if(otherDiv != i) {
                        sum += otherDiv;
                    }
                    System.out.println("div1: " + i);
                    System.out.println("div2: " + otherDiv);
                }
            }
            System.out.println("Summation: " + sum);
        }
    }
}