using System using System Collections Generic using System Linq using

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace Spiski
{
    public class Node
    {
        public int val;
        public Node next;


        public Node(int x) // присв. значение и указатель
        {
            val = x;
            next = null;
        }
    }

    public class Spisok // создаем список
    {
        Node head = null;


        public void Add(int x)
        {
            Node t = new Node(x);
            t.next = head;
            head = t;
        }

        public void Delete()
        {
            head = head.next;
        }

        public void Print()
        {
            Node now = head;
            while (true)
            {
                Console.WriteLine(now.val);
                now = now.next;
                if (now == null)
                    return;
            }
        }

        public int f(int a, int b)
        {
            return a + b;
        }
        public int svert()
        {

            Node now = head;

            while (true)
            {
                now.next.val = now.val + now.next.val;
                now = now.next;
                Delete();
                if (now.next == null)
                {
                    Print();
                    return now.val;
                }
            }
        }
        public bool vhod(int i)
        {

        }
    }
    class Program
    {
        static void Main(string[] args)
        {
            Spisok[] m = new Spisok[5];

            Spisok s = new Spisok();
            s.Add(60);
            s.Add(30);
            s.Add(400);
            s.svert();

        }
    }
}