import java.util.*;

public class Main {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        long n = Long.parseLong(sc.next());
        long temp = n, sum = 1, tnum;
        for(int i = 2; i <= temp; i++) {
            if(temp % i == 0) {
                tnum = 1;
                while(temp % i == 0) {
                    temp /= i;
                    tnum = tnum * i + tnum;
                }
                sum *= tnum;
                
            }
        }
        System.out.println(sum);
    }
}