#include <bits/stdc++.h>
using namespace std;

int main()
{
	int64_t H, W;
	cin >> H >> W;
	vector<vector<int64_t>> A(H, vector<int64_t>(W));
	for(int64_t i = 0; i < H; i++) for(int64_t j = 0; j < W; j++) cin >> A[i][j];
	
	vector<vector<vector<int64_t>>> dp(H, vector<vector<int64_t>>(W, vector<int64_t>(2, -1)));
	dp[0][0][0] = A[0][0];
	for(int64_t i = 0; i < H; i++)
	{
		for(int64_t j = 0; j < W; j++)
		{
			if(i == 0 && j == 0) continue;
			for(int64_t k = 0; k < 2; k++)
			{
				if(i != 0)
				{
					if(dp[i - 1][j][k] != -1)
					{
						if(A[i][j] < dp[i - 1][j][k]) dp[i][j][k] = dp[i - 1][j][k] + A[i][j];
						else if(k == 0 && (i != H - 1 || j != W - 1)) dp[i][j][1] = dp[i - 1][j][0];
					}
				}
				if(j != 0)
				{
					if(dp[i][j - 1][k] != -1)
					{
						if(A[i][j] < dp[i][j - 1][k]) dp[i][j][k] = max(dp[i][j][k], dp[i][j - 1][k] + A[i][j]);
						else if(k == 0 && (i != H - 1 || j != W - 1)) dp[i][j][1] = max(dp[i][j][1], dp[i][j - 1][0]);
					}
				}
			}
		}
	}
	if(dp[H - 1][W - 1][0] != -1 || dp[H - 1][W - 1][1] != -1) cout << "Yes" << endl;
	else cout << "No" << endl;
	return 0;
}