import sys
input = sys.stdin.readline
import heapq

H,W,x,y=map(int,input().split())
A=[list(map(int,input().split())) for i in range(H)]

x-=1
y-=1
NOW=A[x][y]

B=0
USE=[[0]*W for i in range(H)]

USE[0][0]=1

Q=[]

for z,w in [(x+1,y),(x-1,y),(x,y+1),(x,y-1)]:
    if 0<=z<H and 0<=w<W:
        heapq.heappush(Q,(A[z][w],z,w))
        USE[z][w]=1

while Q:
    if Q[0][0]<NOW:
        p,x,y=heapq.heappop(Q)
        NOW+=p
        USE[x][y]=1

        for z,w in [(x+1,y),(x-1,y),(x,y+1),(x,y-1)]:
            if 0<=z<H and 0<=w<W and USE[z][w]==0:
                heapq.heappush(Q,(A[z][w],z,w))
                USE[z][w]=1

    else:
        print("No")
        exit()

print("Yes")