import sys
input = lambda :sys.stdin.readline()[:-1]
ni = lambda :int(input())
na = lambda :list(map(int,input().split()))
yes = lambda :print("yes");Yes = lambda :print("Yes");YES = lambda : print("YES")
no = lambda :print("no");No = lambda :print("No");NO = lambda : print("NO")
#######################################################################

h,w = na()
a = [na() for i in range(h)]
dp = [[-float("inf") for j in range(w)]for i in range(h)]
ndp = [[-float("inf") for j in range(w)]for i in range(h)]
dp[0][0] = a[0][0]
for i in range(h):
    for j in range(w):
        if i < h-1 and dp[i][j] > a[i+1][j]:
            dp[i+1][j] = max(dp[i+1][j], dp[i][j] + a[i+1][j])
        if i < h-1 and ndp[i][j] > a[i+1][j]:
            ndp[i+1][j] = max(ndp[i+1][j], ndp[i][j] + a[i+1][j])
        if i < h-1 and ((i+1,j)!=(h-1,w-1)):
            ndp[i+1][j] = max(ndp[i+1][j], dp[i][j])
        if j < w-1 and dp[i][j] > a[i][j+1]:
            dp[i][j+1] = max(dp[i][j+1], dp[i][j] + a[i][j+1])
        if j < w-1 and ndp[i][j] > a[i][j+1]:
            ndp[i][j+1] = max(ndp[i][j+1], ndp[i][j] + a[i][j+1])
        if j < w-1 and ((i,j+1)!=(h-1,w-1)):
            ndp[i][j+1] = max(ndp[i][j+1], dp[i][j])
    
if dp[-1][-1] > 0 or ndp[-1][-1] > 0:
    Yes()
else:
    No()