import sys
input = lambda :sys.stdin.readline()[:-1]
ni = lambda :int(input())
na = lambda :list(map(int,input().split()))
yes = lambda :print("yes");Yes = lambda :print("Yes");YES = lambda : print("YES")
no = lambda :print("no");No = lambda :print("No");NO = lambda : print("NO")
#######################################################################

h,w,y,x = na()
y-=1
x-=1
a = [na() for i in range(h)]

from heapq import *
hq = [(a[y][x], y, x)]
z = a[y][x]
hq = []
visited = [[0 for j in range(w)]for i in range(h)]
visited[y][x] = 1
for dy, dx in [[1,0],[-1,0],[0,1],[0,-1]]:
    nx = x + dx
    ny = y + dy
    if 0 <= ny < h and 0 <= nx < w and visited[ny][nx]^1:
        heappush(hq, (a[ny][nx],ny,nx))
        visited[ny][nx] = 1
ans = 1
while hq:
    v,y,x = heappop(hq)#print(v,y,x)
    if z <= v:
        ans = 0
        break
    z += v
    for dy, dx in [[1,0],[-1,0],[0,1],[0,-1]]:
        nx = x + dx
        ny = y + dy
        if 0 <= ny < h and 0 <= nx < w and visited[ny][nx]^1:
            heappush(hq, (a[ny][nx],ny,nx))
            visited[ny][nx] = 1
if ans:
    Yes()
else:
    No()