#define _USE_MATH_DEFINES
#include <bits/stdc++.h>
using namespace std;
#define FOR(i,m,n) for(int i=(m);i<(n);++i)
#define REP(i,n) FOR(i,0,n)
#define ALL(v) (v).begin(),(v).end()
using ll = long long;
constexpr int INF = 0x3f3f3f3f;
constexpr long long LINF = 0x3f3f3f3f3f3f3f3fLL;
constexpr double EPS = 1e-8;
constexpr int MOD = 1000000007;
// constexpr int MOD = 998244353;
constexpr int DY4[]{1, 0, -1, 0}, DX4[]{0, -1, 0, 1};
constexpr int DY8[]{1, 1, 0, -1, -1, -1, 0, 1};
constexpr int DX8[]{0, -1, -1, -1, 0, 1, 1, 1};
template <typename T, typename U>
inline bool chmax(T& a, U b) { return a < b ? (a = b, true) : false; }
template <typename T, typename U>
inline bool chmin(T& a, U b) { return a > b ? (a = b, true) : false; }
struct IOSetup {
  IOSetup() {
    std::cin.tie(nullptr);
    std::ios_base::sync_with_stdio(false);
    std::cout << fixed << setprecision(20);
  }
} iosetup;

int main() {
  int h, w, y, x; cin >> h >> w >> y >> x; --y; --x;
  vector a(h, vector(w, 0)); REP(i, h) REP(j, w) cin >> a[i][j];
  priority_queue<pair<int, pair<int, int>>, vector<pair<int, pair<int, int>>>, greater<pair<int, pair<int, int>>>> que;
  que.emplace(0, make_pair(y, x));
  ll attack = a[y][x];
  a[y][x] = 0;
  while (!que.empty()) {
    const auto [a_ij, ij] = que.top(); que.pop();
    const auto [i, j] = ij;
    if (a_ij >= attack) {
      cout << "No\n";
      return 0;
    }
    attack += a_ij;
    REP(k, 4) {
      const int y = i + DY4[k], x = j + DX4[k];
      if (0 <= y && y < h && 0 <= x && x < w && a[y][x] != 0) {
        que.emplace(a[y][x], make_pair(y, x));
        a[y][x] = 0;
      }
    }
  }
  cout << "Yes\n";
  return 0;
}