using System;
using System.Collections.Generic;
using System.Linq;

namespace Test
{
    public class Program
    {
        public static void Main()
        {
            int[] nums = Console.ReadLine().Split().Select(int.Parse).ToArray();


              while(nums.Length > 1)
              {
                int[] condensed = new int[nums.Length - 1];

                for(int i = 0; i < nums.Length - 1; i ++)
                {
                    condensed[i] = nums[i] + nums[i + 1];
                }

                nums = condensed;


              }

            Console.WriteLine(string.Join(" ", nums));


        }

    }
}