h, w = map(int, input().split())
A = [list(map(int, input().split())) for _ in range(h)]

DP = [[[-1 for _ in range(2)] for _ in range(w)] for _ in range(h)]
DP[0][0][0] = A[0][0]
Directions = [(1, 0), (0, 1)]
for i in range(h):
    for j in range(w):
        for di, dj in Directions:
            ni, nj = i + di, j + dj
            if 0 <= ni < h and 0 <= nj < w:
                if DP[i][j][0] != -1:
                    if DP[i][j][0] > A[ni][nj]:
                        DP[ni][nj][0] = max(DP[ni][nj][0], DP[i][j][0] + A[ni][nj])
                    else:
                        if ni != h - 1 and nj != w - 1:
                            DP[ni][nj][1] = max(DP[ni][nj][1], DP[i][j][0])
                if DP[i][j][1] != -1:
                    if DP[i][j][1] > A[ni][nj]:
                        DP[ni][nj][1] = max(DP[ni][nj][1], DP[i][j][1] + A[ni][nj])
if DP[-1][-1][0] != -1 or DP[-1][-1][1] != -1:
    print("Yes")
else:
    print("No")