#include <bits/stdc++.h>
#include <atcoder/all>
using namespace std;
using namespace atcoder;
//const long nPrime = 1000000007;
//const long nPrime = 998244353;
typedef long long ll;
int main() {
    ll h,w,x,y;
    cin >> h >> w >> x >> y;
    x--,y--;
    vector<vector<ll>> vviNum(h,vector<ll>(w,0));
    for(ll i = 0; i < h; i++){
        for(ll j = 0; j < w; j++){
            cin >> vviNum[i][j];
        }
    }
    
    multimap<ll,ll> siTmp;
    vector<vector<ll>> vviCheck(h,vector<ll>(w,0));
    ll nTmp = vviNum[x][y];
    vviCheck[x][y] = 1;
    if(x > 0){
        siTmp.insert(make_pair(vviNum[x-1][y], (x-1)*w+y));
        vviCheck[x-1][y] = 1;
    }
    if(y > 0){
        siTmp.insert(make_pair(vviNum[x][y-1], x*w+y-1));
        vviCheck[x][y-1] = 1;
    }
    if(x < h-1){
        siTmp.insert(make_pair(vviNum[x+1][y], (x+1)*w+y));
        vviCheck[x+1][y] = 1;
    }
    if(y < w-1){
        siTmp.insert(make_pair(vviNum[x][y+1], x*w+y+1));
        vviCheck[x][y+1] = 1;
    }
    while(!siTmp.empty()){
        auto itr = siTmp.begin();
        if(itr->first >= nTmp){
            break;
        }
        nTmp += itr->first;
        ll i = itr->second / w;
        ll j = itr->second % w;
        siTmp.erase(itr);
        if(i > 0 && vviCheck[i-1][j] == 0){
            siTmp.insert(make_pair(vviNum[i-1][j], (i-1)*w+j));
            vviCheck[i-1][j] = 1;
        }
        if(j > 0 && vviCheck[i][j-1] == 0){
            siTmp.insert(make_pair(vviNum[i][j-1], i*w+j-1));
            vviCheck[i][j-1] = 1;
        }
        if(i < h-1 && vviCheck[i+1][j] == 0){
            siTmp.insert(make_pair(vviNum[i+1][j], (i+1)*w+j));
            vviCheck[i+1][j] = 1;
        }
        if(j < w-1 && vviCheck[i][j+1] == 0){
            siTmp.insert(make_pair(vviNum[i][j+1], i*w+j+1));
            vviCheck[i][j+1] = 1;
        }
    }
    
    if(siTmp.empty()){
        cout << "Yes" <<endl;
    }else {
        cout << "No" <<endl;
    }
    return 0;
}