import sys
#input = sys.stdin.readline
input = sys.stdin.buffer.readline #文字列はダメ
#sys.setrecursionlimit(1000000)
#import bisect
#import itertools
#import random
from heapq import heapify, heappop, heappush
#from collections import defaultdict 
#from collections import deque
#import copy
#import math
#from functools import lru_cache
#@lru_cache(maxsize=None)
#MOD = pow(10,9) + 7
#MOD = 998244353
dx = [1,0,-1,0]
dy = [0,1,0,-1]
#dx8 = [1,1,0,-1,-1,-1,0,1]
#dy8 = [0,1,1,1,0,-1,-1,-1]

base = 505

def main():
    H,W,Y,X = map(int,input().split()); INF = pow(10,18)
    X -= 1; Y -= 1
    A = [list(map(int,input().split())) for _ in range(H)]

    PQ = []
    heappush(PQ,Y*base+X)
    ok = [[0]*W for _ in range(H)]
    power = A[Y][X]
    while PQ:
        idx = heappop(PQ)
        y = idx//base
        x = idx%base
        #print(x,y,A[y][x])
        if ok[y][x] == 1: continue
        if power < A[y][x]: continue
        ok[y][x] = 1
        for d in range(4):
            ny = y + dy[d]
            nx = x + dx[d]
            if ny < 0 or ny >= H or nx < 0 or nx >= W: continue
            if ok[ny][nx] == 1: continue #既に倒している。
            if A[ny][nx] < power:
                power += A[ny][nx]
                ok[ny][nx] = 1
                for dd in range(4):
                    nny = ny + dy[dd]
                    nnx = nx + dx[dd]
                    if nny < 0 or nny >= H or nnx < 0 or nnx >= W: continue
                    if ok[nny][nnx] == 1: continue #既に倒している。
                    heappush(PQ, nny*base + nnx)
            else:
                heappush(PQ, ny*base + nx)
    #print(power)
    #print(ok)
    for i in range(H):
        for j in range(W):
            if ok[i][j] == 0:
                print('No')
                exit()
    print('Yes')



if __name__ == '__main__':
    main()