#include <bits/stdc++.h>
#include <atcoder/all>
using namespace atcoder;
using mint = modint998244353;
using namespace std;
#define rep(i,n) for (int i = 0; i < (n); ++i)
#define Inf 1000000001


int main() {
    
	int H,W;
	cin>>H>>W;
	vector a(H,vector<int>(W));
	rep(i,H){
		rep(j,W)cin>>a[i][j];
	}
	
	vector dp(H,vector(W,vector<int>(2,-Inf)));
	dp[0][0][0] = a[0][0];
	rep(i,H){
		rep(j,W){
			rep(k,2){
				if(i!=H-1){
					int ii = i+1,jj = j;
					if(dp[i][j][k] > a[ii][jj]){
						dp[ii][jj][k] = max(dp[ii][jj][k],min(Inf,dp[i][j][k]+a[ii][jj]));
					}
					else{
						if(k==0 && (ii!=H-1 || jj!=W-1)){
							dp[ii][jj][1] = max(dp[ii][jj][1],dp[i][j][k]);
						}
					}
					
				}
				if(j!=W-1){
					int ii = i,jj = j+1;
					if(dp[i][j][k] > a[ii][jj]){
						dp[ii][jj][k] = max(dp[ii][jj][k],min(Inf,dp[i][j][k]+a[ii][jj]));
					}
					else{
						if(k==0 && (ii!=H-1 || jj!=W-1)){
							dp[ii][jj][1] = max(dp[ii][jj][1],dp[i][j][k]);
						}
					}
					
					
				}
				
			}
		}
	}
	int ans = max(dp[H-1][W-1][0],dp[H-1][W-1][1]);
	if(ans==-Inf)cout<<"No"<<endl;
	else cout<<"Yes"<<endl;
	
    return 0;
}