using System;

public class Hello
{
    static void Main()
    {
        string[] line = Console.ReadLine().Trim().Split(' ');
        var h = int.Parse(line[0]);
        var w = int.Parse(line[1]);
        var sy = int.Parse(line[2]) - 1;
        var sx = int.Parse(line[3]) - 1;
        var ans = 0L;
        var a = new long[h * w - 1];
        var p = 0;
        for (int i = 0; i < h; i++)
        {
            line = Console.ReadLine().Trim().Split(' ');
            for (int j = 0; j < w; j++)
            {
                var t = int.Parse(line[j]);
                if (i == sx && j == sy) ans = t;
                else a[p++] = t;
            }
        }
        getAns(h * w - 1, a, ans);
    }
    static void getAns(int n, long[] a, long ans)
    {
        Array.Sort(a);
        foreach (var x in a)
        {
            if (ans > x) ans += x;
            else { Console.WriteLine("NO"); return; }
        }
        Console.WriteLine("YES");
    }
}