def make3d(a, b, c):
    return [[[0] * c for _ in range(b)] for _ in range(a)]


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

dp = make3d(H+1, W+1, 2)
dp[0][0][0] = A[0][0]
A[0][0] = 0
for i in range(H):
    for j in range(W):
        for k in range(2):
            if dp[i][j][k] > A[i][j]:
                dp[i+1][j][k] = max(dp[i+1][j][k], dp[i][j][k] + A[i][j])
                dp[i][j+1][k] = max(dp[i][j+1][k], dp[i][j][k] + A[i][j])
            elif k == 0 and dp[i][j][k] > 0:
                dp[i+1][j][1] = max(dp[i+1][j][k], dp[i][j][k])
                dp[i][j+1][1] = max(dp[i][j+1][k], dp[i][j][k])

for k in range(2):
    if dp[H-1][W-1][k] > A[H-1][W-1]:
        print('Yes')
        break
else:
    print('No')