import sys

# sys.setrecursionlimit(200005)
int1 = lambda x: int(x)-1
pDB = lambda *x: print(*x, end="\n", file=sys.stderr)
p2D = lambda x: print(*x, sep="\n", end="\n\n", file=sys.stderr)
def II(): return int(sys.stdin.readline())
def LI(): return list(map(int, sys.stdin.readline().split()))
def LLI(rows_number): return [LI() for _ in range(rows_number)]
def LI1(): return list(map(int1, sys.stdin.readline().split()))
def LLI1(rows_number): return [LI1() for _ in range(rows_number)]
def SI(): return sys.stdin.readline().rstrip()
dij = [(0, 1), (-1, 0), (0, -1), (1, 0)]
# dij = [(0, 1), (-1, 0), (0, -1), (1, 0), (1, 1), (1, -1), (-1, 1), (-1, -1)]
inf = (1 << 63)-1
# inf = (1 << 31)-1
md = 10**9+7
# md = 998244353

from heapq import *

h, w, i, j = LI()
aa = LLI(h)

i, j = i-1, j-1
hp = [(0, i, j)]
now = aa[i][j]
aa[i][j] = -1

while hp:
    a, i, j = heappop(hp)
    if a >= now:
        print("No")
        exit()
    now += a
    for di, dj in dij:
        ni, nj = i+di, j+dj
        if ni < 0 or nj < 0 or ni >= h or nj >= w: continue
        if aa[ni][nj] == -1: continue
        heappush(hp, (aa[ni][nj], ni, nj))
        aa[ni][nj] = -1

print("Yes")