import sys
import numpy as np
from heapq import heappush, heappop


def main():
    h, w, sy, sx = map(int, input().split())
    A = np.fromstring(sys.stdin.read(), np.int64, sep=' ').reshape(-1, w)
    sy -= 1
    sx -= 1
    b = A[sy, sx]
    A[sy, sx] = 0
    q = [(0, sy, sx)]
    cnt = 0
    dyx = [[1, 0], [-1, 0], [0, 1], [0, -1]]
    B = np.zeros_like(A, np.bool_)
    B[sy, sx] = True
    while q:
        a, y, x = heappop(q)
        if b <= a: break
        cnt += 1
        b += a
        for i in range(4):
            dy, dx = dyx[i]
            Y, X = y + dy, x + dx
            if Y < 0 or Y >= h or X < 0 or X >= w: continue
            if B[Y, X]: continue
            heappush(q, (A[Y, X], Y, X))
            B[Y, X] = True
    print('Yes' if cnt == h * w else 'No')




if __name__ == '__main__':
    main()