import java.util.Scanner;
class Java{
    static int sum(int[] arr,int n){
        if(n<=0) return 0;
        else return sum(arr,n-1)+arr[n-1];
    }
    
    public static void main(String[]args){
        Scanner sc=new Scanner(System.in);
        int n=sc.nextInt();
        
        if(n<0){
            System.out.println("Invalid input");
        }else{
            int arr[]=new int[n];
            for (int i=0;i<n;i++){
                arr[i]=sc.nextInt();
            }
        }
        System.out.println(sum(arr,n));
    }
}