h,w,x,y=map(int,input().split())
dx=[0,0,1,-1]
dy=[1,-1,0,0]
a=[list(map(int,input().split())) for i in range(h)]
d=[[0]*w for i in range(h)]
d[x-1][y-1]=1
hq=[(a[x-1][y-1],x-1,y-1)]
t,cnt=0,0
import heapq
while hq:
    p,x,y=heapq.heappop(hq)
    if cnt>0 and t<=a[x][y]:exit(print("No"))
    cnt+=1
    t+=a[x][y]
    for i in range(4):
        if 0<=x+dx[i]<h and 0<=y+dy[i]<w and d[x+dx[i]][y+dy[i]]==0:
            d[x+dx[i]][y+dy[i]]=1
            heapq.heappush(hq,(a[x+dx[i]][y+dy[i]],x+dx[i],y+dy[i]))
    
print("Yes")