using System;
using System.Collections.Generic;

class Program
{
    public static void Main(string[] args)
    {
        var firstline = Console.ReadLine().Split(' ');
        var n = long.Parse(firstline[0]);
        var d = long.Parse(firstline[1]);
        var t = long.Parse(firstline[2]);
        var secondline = Console.ReadLine().Split(' ');
        var minMaxDictionary = new Dictionary<long, List<Tuple<long, long>>>();
        for (long i = 0; i < n; i++)
        {
            var position = long.Parse(secondline[i]);
            var key = (d + position % d) % d;
            if (minMaxDictionary.ContainsKey(key))
            {
                minMaxDictionary[key].Add(new Tuple<long, long>(position - d * t, position + d * t));
            }
            else
            {
                minMaxDictionary.Add(key, new List<Tuple<long, long>> { new Tuple<long, long>(position - d * t, position + d * t) }); ;                
            }
        }
        long count = 0;
        foreach (var element in minMaxDictionary)
        {
            var minMaxs = element.Value;
            minMaxs.Sort((tuple, tuple1)=>tuple.Item1.CompareTo(tuple1.Item1));

            long min = long.MaxValue;
            long max = long.MinValue;
            foreach (var minMax in minMaxs)
            {
                count += (minMax.Item2 - minMax.Item1) / d + 1;
                if (minMax.Item1 <= max)
                {
                    count -= (max - minMax.Item1) / d + 1;
                }
                min = Math.Min(min, minMax.Item1);
                max = Math.Max(max, minMax.Item2);
            }
        }
        Console.WriteLine(count);
    }
}