using System.Collections.Generic;
using System;

public class PriorityQueue<T> where T : IComparable
{
    private IComparer<T> _comparer = null;
    private int _type = 0;
    private T[] _heap;
    private int _sz = 0;
    private int _count = 0;
    public PriorityQueue(int maxSize, IComparer<T> comparer)
    {
        _heap = new T[maxSize];
        _comparer = comparer;
    }
    public PriorityQueue(int maxSize, int type = 0)
    {
        _heap = new T[maxSize];
        _type = type;
    }
    private int Compare(T x, T y)
    {
        if (_comparer != null) return _comparer.Compare(x, y);
        return _type == 0 ? x.CompareTo(y) : y.CompareTo(x);
    }
    public void Push(T x)
    {
        _count++;
        var i = _sz++;
        while (i > 0)
        {
            var p = (i - 1) / 2;

            if (Compare(_heap[p], x) <= 0) break;

            _heap[i] = _heap[p];
            i = p;
        }
        _heap[i] = x;
    }
    public T Pop()
    {
        _count--;
        T ret = _heap[0];
        T x = _heap[--_sz];

        int i = 0;
        while (i * 2 + 1 < _sz)
        {
            int a = i * 2 + 1;
            int b = i * 2 + 2;

            if (b < _sz && Compare(_heap[b], _heap[a]) < 0) a = b;

            if (Compare(_heap[a], x) >= 0) break;

            _heap[i] = _heap[a];
            i = a;
        }
        _heap[i] = x;
        return ret;
    }
    public int Count() => _count;
    public T Peek() => _heap[0];
    public bool Contains(T x)
    {
        for (int i = 0; i < _sz; i++) if (x.Equals(_heap[i])) return true;
        return false;
    }
    public void Clear()
    {
        while (this.Count() > 0) this.Pop();
    }
    public IEnumerator<T> GetEnumerator()
    {
        var ret = new List<T>();
        while (this.Count() > 0)
        {
            ret.Add(this.Pop());
        }
        foreach (var r in ret)
        {
            this.Push(r);
            yield return r;
        }
    }
    public T[] ToArray()
    {
        T[] array = new T[_sz];
        int i = 0;
        foreach (var r in this)
        {
            array[i++] = r;
        }
        return array;
    }
}
public class P : IComparable
{
    public int x { get; set; }
    public int y { get; set; }
    public long d { get; set; }
    public int CompareTo(object obj)
    {
        var p = (P)obj;
        if (this.d > p.d) return 1;
        else if (this.d == p.d) return 0;
        else return -1;
    }
}
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 sx = int.Parse(line[2]) - 1;
        var sy = int.Parse(line[3]) - 1;
        getAns(h, w, sx, sy);
    }
    static void getAns(int h, int w, int sx, int sy)
    {
        var dx = new int[] { 0, 1, 0, -1 };
        var dy = new int[] { 1, 0, -1, 0 };
        var ans = 0L;
        var pq = new PriorityQueue<P>(h * w + 10);
        var asum = 0L;
        for (int i = 0; i < h; i++)
        {
            string[] line = Console.ReadLine().Trim().Split(' ');
            for (int j = 0; j < w; j++)
            {
                var t = long.Parse(line[j]);
                asum += t;
                if (i == sx && j == sy) ans = t;
                else pq.Push(new P { d = t, x = i, y = j });
            }
        }
        var map = new bool[h, w];
        map[sx, sy] = true;
        var te = new List<P>();
        while (pq.Count() > 0)
        {
            var ww = pq.Pop();
            if (ans <= ww.d) { te.Add(ww); continue; }
            for (int i = 0; i < 4; i++)
            {
                var nx = ww.x + dx[i];
                var ny = ww.y + dy[i];
                if (nx >= 0 && nx < h && ny >= 0 && ny < w && map[nx,ny])
                {
                    ans += ww.d;
                    map[ww.x, ww.y] = true;
                    foreach (var z in te) pq.Push(z);
                    te.Clear();
                    goto next;
                }
            }
            te.Add(ww);
        next:;
        }
        Console.WriteLine(ans == asum? "Yes":"No");
    }
}