H,W,Y,X = map(int,input().split())

seen = [[False] * W for _ in range(H)]
INF = float('inf')
memo = [[-INF] * W for _ in range(H)]
A = []
for _ in range(H):
    tmp = list(map(int,input().split()))
    A.append(tmp)
def check(h,w):
    if 0 <= h < H and 0 <= w < W:
        return True
    else:
        return False
ans = False
def dfs(h,w,a):
    global ans
    if h == H -1 and w == W-1:
        print('Yes')
        exit()
    seen[h][w] = True
    if memo[h][w] >= a:
        return 
    memo[h][w] = a
    for dh,dw in [(-1,0),(1,0),(0,1),(0,-1)]:
        nh = h + dh
        nw = w + dw
        if check(nh,nw) and not seen[nh][nw] and A[nh][nw] < a:
            dfs(nh,nw,a + A[nh][nw])
            seen[nh][nw] = False
        if check(nh,nw) and seen[nh][nw] and memo[nh][nw] < a:
            dfs(nh,nw,a)
dfs(Y-1,X-1,A[Y-1][X-1])
print('No')