Java Sum2

import java.io.*;
import java.util.*;
import java.text.*;
import java.math.*;
import java.util.regex.*;
import java.util.Scanner;

public class Solution {

    private final static Scanner scanner = new Scanner(System.in);
    public static void main(String[] args) {

        int num ;
        long num2;
        long sum = 0;
        num = scanner.nextInt();
        if ((num < 0) || (num >1000))
            {
            System.exit(0);
        }
       
        for(int i=0;i<num;i++)
            {
            num2 = scanner.nextLong();
            if((num2>=0) && (num2<=Math.pow(10,10))){
           
            sum = sum + num2;       
            }
        }
         System.out.println(sum);
       
    }
}