import java.util.Scanner;
 
public class Main {
    public static void main(String[] args) {
 
        Scanner scanner = new Scanner(System.in);
 
       long N= scanner.nextLong();
       long []arr= new long[(int)N];
       for(int i=0;i<N;i++){
           arr[i]= scanner.nextInt();
       }
       long sum=0;
       for(int i=0;i<N;i++){
           sum+=arr[i];
       }
        System.out.println(Math.abs(sum));
 
 
 
        scanner.close();
    }
}
 

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