using System;
using System.Collections.Generic;
using System.Text;
using System.Collections;

namespace ConsoleApplication1
{
    class Program
    {
        static void Main(string[] args)
        {
            Queue q = new Queue();

            int n;
            do
            {   n = int.Parse(Console.ReadLine());
                q.Enqueue(n);
            } while (n != 0);
            int sum = 0;
            while (q.Count != 2)
            {
                int a = Convert.ToInt16(q.Dequeue());
                 sum += Math.Abs(a-Convert.ToInt16(q.Peek()));       
            }
            Console.WriteLine("{0}",sum );
            Console.ReadLine();

        }
    }
}
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