#include <bits/stdc++.h>
using namespace std;
#define int long long
signed main(){
  int H,W;
  cin>>H>>W;
  vector<vector<int>> G(H,vector<int>(W));
  for(int i=0;i<H;i++)for(int j=0;j<W;j++) cin>>G[i][j];
  vector<vector<int>> dp(H,vector<int>(W,-1)),ddp(H,vector<int>(W,-1));
  dp[0][0] = G[0][0];
  for(int i=0;i<H;i++){
    for(int j=0;j<W;j++){
      if(i == 0 && j == 0) continue;
      int ans = -1;
      if(i != 0 && dp[i-1][j] > G[i][j]) ans = max(ans,dp[i-1][j]+G[i][j]);
      if(j != 0 && dp[i][j-1] > G[i][j]) ans = max(ans,dp[i][j-1]+G[i][j]);
      if(!(i==H-1 && j == W-1)){
        int sub_ans = -1;
        if(i != 0 && dp[i-1][j] != -1 && dp[i-1][j] <= G[i][j]) sub_ans = max(sub_ans,dp[i-1][j]);
        if(j != 0 && dp[i][j-1] != -1 && dp[i][j-1] <= G[i][j]) sub_ans = max(sub_ans,dp[i][j-1]);
        ddp[i][j] = sub_ans;
      }
      dp[i][j] = ans;
    }
  }
  /*for(int i=0;i<H;i++){
    for(int j=0;j<W;j++){
      cout<<dp[i][j]<<' ';
    }
    cout<<endl;
  }*/
  if(dp[H-1][W-1] != -1 || ddp[H-1][W-1] != -1){
    cout<<"Yes"<<endl;
    return 0;
  }
  for(int i=0;i<H;i++){
    for(int j=0;j<W;j++){
      if(i == 0 && j == 0) continue;
      int ans = ddp[i][j];
      if(i != 0 && G[i][j] < ddp[i-1][j]) ans = max(ans,ddp[i-1][j]+G[i][j]);
      if(j != 0 && G[i][j] < ddp[i][j-1]) ans = max(ans,ddp[i][j-1]+G[i][j]);
      ddp[i][j] = ans;
    }
  }
  if(ddp[H-1][W-1] != -1){
    cout<<"Yes"<<endl;
  }
  else {
    cout<<"No"<<endl;
  }
}