using static System.Math;
using System;

public class Hello
{
    static void Main()
    {
        string[] line = Console.ReadLine().Trim().Split(' ');
        var n = int.Parse(line[0]);
        var s = int.Parse(line[1]);
        var b = int.Parse(line[2]);
        line = Console.ReadLine().Trim().Split(' ');
        var h = Array.ConvertAll(line, int.Parse);
        getAns(n, s, b, h);
    }
    static void getAns(int n, int s, int b, int[] h)
    {
        if (n == 1) { Console.WriteLine("Yes"); return; }
        var nows = s;
        var nowh = h[0];
        for (int i = 1; i < n; i++)
        {
            if (h[i] > nowh)
            {
                var d = h[i] - nowh;
                var needs = (d + b - 1) / b;
                nows -= needs;
                if (nows < 0) 
                {
                    Console.WriteLine("No"); 
                    return;
                }
            }
            nows = s;
            nowh = Max(nowh,  h[i]);
        }
        Console.WriteLine("Yes");
    }
}