import java.util.*;

public class Main {
	public static void main (String[] args) {
    	Scanner sc = new Scanner(System.in);
    	long n = sc.nextLong();
    	long ans = n + 1;
    	for (long i = 2; i <= Math.sqrt(n); i++) {
    	    if (n % i == 0) {
    	        ans += i;
    	        if (i * i < n) {
    	            ans += n / i;
    	        }
    	    }
    	}
    	System.out.println(ans);
    }
}