#include <bits/stdc++.h>
using namespace std;
using ll = long long;
using P = pair<ll,ll>;
using PP = pair<ll, P>;
#define fix(x) fixed << setprecision(x)
#define asc(x) x, vector<x>, greater<x>
#define rep(i, n) for(ll i = 0; i < n; i++)
#define all(x) (x).begin(),(x).end()
template<class T>bool chmin(T&a, const T&b){if(a>b){a=b;return 1;}return 0;}
template<class T>bool chmax(T&a, const T&b){if(a<b){a=b;return 1;}return 0;}
int H[] = {1,0,-1,0}, W[] = {0,1,0,-1};
int main(){
    cin.tie(nullptr);
    ios::sync_with_stdio(false);
    int h,w,y,x;
    cin >> h >> w >> y >> x;
    x--; y--;
    vector<vector<ll>> a(h,vector<ll>(w));
    rep(i,h)rep(j,w) cin >> a[i][j];
    ll now = a[y][x];
    a[y][x] = -1;
    priority_queue<asc(PP)> pq;
    rep(i,4){
        int nh = y+H[i], nw = x+W[i];
        if(nh<0 || nh>=h || nw<0 || nw>=w) continue;
        pq.push({a[nh][nw], {nh, nw}});
        a[nh][nw] = -1;
    }
    while(pq.size()){
        ll s = pq.top().first;
        tie(y,x) = pq.top().second;
        pq.pop();
        if(s>=now){
            cout << "No\n";
            return 0;
        }
        now += s;
        rep(i,4){
            int nh = y+H[i], nw = x+W[i];
            if(nh<0 || nh>=h || nw<0 || nw>=w || a[nh][nw]<0) continue;
            pq.push({a[nh][nw], {nh, nw}});
            a[nh][nw] = -1;
        }
    }
    cout << "Yes\n";
    return 0;
}