H,W=map(int,input().split())

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

inf=float("inf"); huge=2*10**9
DP=[[[-inf,-inf] for _ in range(W+1)] for _ in range(H+1)]

for i in range(1,H+1):
    for j in range(1,W+1):
        if i==j==1:
            DP[i][j]=[A[1][1],-inf]
            continue

        if max(DP[i-1][j][0],DP[i][j-1][0])>A[i][j]:
            DP[i][j][0]=max(DP[i-1][j][0],DP[i][j-1][0])+A[i][j]
        else:
            DP[i][j][1]=max(DP[i-1][j][0],DP[i][j-1][0])

        if max(DP[i-1][j][1],DP[i][j-1][1])>A[i][j]:
            DP[i][j][1]=max(DP[i][j][1], max(DP[i-1][j][1],DP[i][j-1][1])+A[i][j])

        if DP[i][j][0]>huge:
            DP[i][j][0]=inf

        if DP[i][j][1]>huge:
            DP[i][j][1]=inf

if max(DP[H-1][W][0], DP[H-1][W][1], DP[H][W-1][0], DP[H][W-1][1])>A[H][W]:
    print("Yes")
else:
    print("No")