h,w=map(int,input().split())
a=[tuple(map(int,input().split())) for _ in range(h)]
dp=[[[-10**18]*2 for _ in range(w)] for _ in range(h)]
dp[0][0][0]=a[0][0]
for i in range(h):
    for j in range(w):
        if i-1>=0:
            if dp[i-1][j][0]>a[i][j]:
                dp[i][j][0]=max(dp[i][j][0],dp[i-1][j][0]+a[i][j])
            else:
                dp[i][j][1]=max(dp[i][j][1],dp[i-1][j][0])
            if dp[i-1][j][1]>a[i][j]:
                dp[i][j][1]=max(dp[i][j][1],dp[i-1][j][1]+a[i][j])
        if j-1>=0:
            if dp[i][j-1][0]>a[i][j]:
                dp[i][j][0]=max(dp[i][j][0],dp[i][j-1][0]+a[i][j])
            else:
                dp[i][j][1]=max(dp[i][j][1],dp[i][j-1][0])
            if dp[i][j-1][1]>a[i][j]:
                dp[i][j][1]=max(dp[i][j][1],dp[i][j-1][1]+a[i][j])
if dp[-1][-1][1]>a[-1][-1] or dp[-1][-1][0]>0:
    print('Yes')
else:
    print('No')