#include <bits/stdc++.h>
using namespace std;
int main(){
  int H, W;
  cin >> H >> W;
  vector<vector<int>> A(H, vector<int>(W));
  for (int i = 0; i < H; i++){
    for (int j = 0; j < W; j++){
      cin >> A[i][j];
    }
  }
  vector<vector<vector<int>>> dp(2, vector<vector<int>>(H, vector<int>(W, -1)));
  dp[0][0][0] = A[0][0];
  for (int i = 0; i < H; i++){
    for (int j = 0; j < W; j++){
      if (i < H - 1){
        if (dp[0][i][j] > A[i + 1][j]){
          dp[0][i + 1][j] = max(dp[0][i + 1][j], dp[0][i][j] + A[i + 1][j]);
        }
        if (dp[1][i][j] > A[i + 1][j]){
          dp[1][i + 1][j] = max(dp[1][i + 1][j], dp[1][i][j] + A[i + 1][j]);
        }
        if (!(i == H - 2 && j == W - 1)){
          dp[1][i + 1][j] = max(dp[1][i + 1][j], dp[0][i][j]);
        }
      }
      if (j < W - 1){
        if (dp[0][i][j] > A[i][j + 1]){
          dp[0][i][j + 1] = max(dp[0][i][j + 1], dp[0][i][j] + A[i][j + 1]);
        }
        if (dp[1][i][j] > A[i][j + 1]){
          dp[1][i][j + 1] = max(dp[1][i][j + 1], dp[1][i][j] + A[i][j + 1]);
        }
        if (!(i == H - 1 && j == W - 2)){
          dp[1][i][j + 1] = max(dp[1][i][j + 1], dp[0][i][j]);
        }
      }
    }
  }
  if (dp[0][H - 1][W - 1] >= 0 || dp[1][H - 1][W - 1] >= 0){
    cout << "Yes" << endl;
  } else {
    cout << "No" << endl;
  }
}