import sys

int1 = lambda x: int(x) - 1

# input = lambda: sys.stdin.buffer.readline()
input = lambda: sys.stdin.readline().rstrip()
ii = lambda: int(input())
i1 = lambda: int1(input())
mi = lambda: map(int, input().split())
mi1 = lambda: map(int1, input().split())
li = lambda: list(mi())
li1 = lambda: list(mi1())
lli = lambda n: [li() for _ in range(n)]

INF = float("inf")
mod = int(1e9 + 7)
# mod = 998244353

from heapq import heapify, heappop, heappush

h, w, y, x = mi()
y, x = y - 1, x - 1
a = [li() for _ in range(h)]
cur = a[y][x]
a[y][x] = 0
dy = [-1, 0, 1, 0]
dx = [0, -1, 0, 1]
que = []
heapify(que)
for i in range(4):
    ny, nx = y + dy[i], x + dx[i]
    if 0 <= ny < h and 0 <= nx < w:
        heappush(que, (a[ny][nx], ny * w + nx))
        a[ny][nx] = 0
while que:
    v, tmp = heappop(que)
    y, x = tmp // w, tmp % w
    if cur <= v:
        print("No")
        exit(0)
    cur += v
    for i in range(4):
        ny, nx = y + dy[i], x + dx[i]
        if 0 <= ny < h and 0 <= nx < w and a[ny][nx]:
            heappush(que, (a[ny][nx], ny * w + nx))
            a[ny][nx] = 0
print("Yes")