题解 | 1=N

import java.util.*;

public class Main{
    public static void main(String[] args){
        Scanner in = new Scanner(System.in);
        int x = in.nextInt();
        int n = x;
        int ans = 0;
        for(int i = 2; x > 1 && i <= x; i++){
            while(x > 1 && x % i == 0){
                ans += i;
                x /= i;
            }
        }
        System.out.println(ans);
    }
}