import java.util.Scanner;
public class SumNumbersSingleLinkedList {
    public static class SLLNode<Integer> {
    protected int element;
    protected SLLNode<Integer> succ;
    public SLLNode (int elem, SLLNode<Integer> succ) {
    this.element = elem;
    this.succ = succ;
  }
    public void insertAfter(int o, SLLNode<Integer> node){
  if (node != null){
   SLLNode<Integer> ins = new SLLNode<Integer>(o, node.succ);
    node.succ = ins;
  }
}
    public int getElement()
    {
        return element;
    }
}
    public static class SLL<Integer>{
    private SLLNode<Integer> first;
    public SLL (){
    this.first = null;

  }
  public void insertFirst(int o){
  SLLNode<Integer> ins = new SLLNode<Integer>(o, first);
  first = ins;
}
  public SLLNode<Integer>  getFirst()
  {
      return this.first;
  }
}

    public static void main(String[] args) {
       Scanner Scanner=new Scanner(System.in);
       int N,i,j;
       SLL<Integer> nova = new SLL();
       SLLNode<Integer> temp= new SLLNode(0,nova.getFirst());
       SLLNode<Integer> temp1= new SLLNode(0,nova.getFirst());
       N=Scanner.nextInt();
       for(i=0;i<N;i++){
           j=Scanner.nextInt();
        if(i==0)
        {
            nova.insertFirst(j);
            temp = nova.getFirst();

        }
        else
        {
            temp1.insertAfter(j, temp);
            temp=temp.succ;
           // temp.succ.succ = null;
        }

       }
       int suma=0;
       temp.succ=nova.getFirst();
       //System.out.print(temp.succ.getElement());
       for(i =0;i<N;i++)
       {
           suma+=temp.succ.getElement();
           if(temp.succ!=null)
           temp= temp.succ;

       }
       System.out.print(suma);
    }
}