import heapq

H,W,Y,X = map(int, input().split())
A = []
for _ in range(H):
    A.append(list(map(int, input().split())))

if not(1<=H<=500 and 1<=W<=500 and len(A)==H and 1<=Y<=H and 1<=X<=W):
    exit()
for a in A:
    if not (len(a)==W and 1<=min(a) and max(a)<=10**9):
        exit()


T = [[0]*W for _ in range(H)]
Y,X=Y-1,X-1
heap = []
T[Y][X]=1
V = A[Y][X]
A[Y][X]=0
heapq.heappush(heap,(A[Y][X],Y,X))

HI = [1,0,-1,0]
WI = [0,1,0,-1]
while len(heap):
    v,h,w = heapq.heappop(heap)
    if V<=v:
        print('No')
        exit()
    V+=v
    for i in range(4):
        nh=h+HI[i]
        nw=w+WI[i]
        if 0<=nh<H and 0<=nw<W and T[nh][nw]==0:
            T[nh][nw]=1
            heapq.heappush(heap,(A[nh][nw],nh,nw))
print('Yes')