H,W = map(int,input().split())
A = [list(map(int,input().split())) for _ in range(H)]
DP1 = [[-1] * W for _ in range(H)]
DP2 = [[-1] * W for _ in range(H)]
for i in range(H):
    for j in range(W):
        if i == 0 and j == 0:
            DP1[0][0] = A[0][0]
            continue
        if i - 1 >= 0:
            if DP1[i-1][j] > A[i][j]:
                DP1[i][j] = max(DP1[i][j], DP1[i-1][j] + A[i][j])
            else:
                DP2[i][j] = max(DP2[i][j], DP1[i-1][j])
            if DP2[i-1][j] > A[i][j]:
                DP2[i][j] = max(DP2[i][j], DP2[i-1][j] + A[i][j])
        if j - 1 >= 0:
            if DP1[i][j-1] > A[i][j]:
                DP1[i][j] = max(DP1[i][j], DP1[i][j-1] + A[i][j])
            else:
                DP2[i][j] = max(DP2[i][j], DP1[i][j-1])
            if DP2[i][j-1] > A[i][j]:
                DP2[i][j] = max(DP2[i][j], DP2[i][j-1] + A[i][j])
if DP1[-1][-1] > A[-1][-1] or DP2[-1][-1] > A[-1][-1]:
    print('Yes')
else:
    print('No')