import java.util.*;
public class Main{
    public static void main(String[] args){
        Scanner sc=new Scanner(System.in);
        int a=sc.nextInt();
        if(a <= 0){
            System.out.println("Invalid input");
            break;
        }
        int s=0;
        if(a < 1){
            System.out.println("Invalid input");
            return;
        }
        for(int i = 1;i <= a;i++){
            int n=sc.nextInt();
                if(n < 1){
                    System.out.println("Invalid input");
                    return;
                }
                int sum = 0;
                for(int j = 1;j < n;j++){
                    if(n % j == 0)
                    {
                    sum += j;
                    }
                    
                } 
            if(sum == n){
                s+=n;
            }
        }
        if(s <= 0){
            System.out.println("Invalid input");
        }
        else{
            System.out.println(s); 
        }
        
    }
}