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

int main(){
  ios::sync_with_stdio(false);
  cin.tie(nullptr);
  int H,W,sH,sW;
  cin>>H>>W>>sH>>sW;
  vector<vector<int>>A(H,vector<int>(W));
  for(int i=0;i<H;i++){
    for(int &j:A[i])cin>>j;
  }
  --sH,--sW;
  long long P=A[sH][sW];
  int dh[4]={0,1,0,-1};
  int dw[4]={-1,0,1,0};
  vector<vector<bool>>vst(H,vector<bool>(W));
  vst[sH][sW]=true;
  priority_queue<pair<int,array<int,2>>,vector<pair<int,array<int,2>>>,greater<pair<int,array<int,2>>>>pq;
  pq.push({0,{sH,sW}});
  while(pq.size()){
    int h=pq.top().second[0],w=pq.top().second[1],k=pq.top().first;
    pq.pop();
    if(k>=P){
      cout<<"No\n";
      return 0;
    }
    P+=k;
    for(int i=0;i<4;i++){
      if(h+dh[i]>=0&&h+dh[i]<H&&w+dw[i]>=0&&w+dw[i]<W&&!vst[h+dh[i]][w+dw[i]]){
        vst[h+dh[i]][w+dw[i]]=true;
        pq.push({A[h+dh[i]][w+dw[i]],{h+dh[i],w+dw[i]}});
      }
    }
  }
  cout<<"Yes\n";
}