use std::collections::BinaryHeap;
use std::cmp::Reverse;

fn main() {
    let (h,w,mut y,mut x) : (usize,usize,usize,usize) = input_t4();
    let mut a = Vec::new();
    for _ in 0..h { a.push(input_vec::<usize>()); }
    y-=1; x-=1;

    let mut now = a[y][x];
    let mut pq = BinaryHeap::new();
    let mut ok = vec![vec![false; w]; h];
    let mut add = vec![vec![false; w]; h];

    pq.push((Reverse(0), y, x));

    while let Some((Reverse(v), y, x)) = pq.pop() {
        if now <= v { break }
        now += v;
        ok[y][x] = true;

        for (dx, dy) in vec![(!0,0),(1,0),(0,!0),(0,1)] {
            let xi = x.wrapping_add(dx);
            let yi = y.wrapping_add(dy);
            if xi>=w || yi>=h { continue }
            if ok[yi][xi] || add[yi][xi] { continue }
            add[yi][xi] = true;
            pq.push((Reverse(a[yi][xi]), yi, xi));
        }
    }

    println!("{}", if ok.iter().flatten().all(|f| *f) {"Yes"} else {"No"});
}

#[allow(dead_code)] fn input<T: std::str::FromStr>() -> T { let mut s = String::new(); std::io::stdin().read_line(&mut s).ok(); s.trim().parse().ok().unwrap() } #[allow(dead_code)] fn input_t<T: std::str::FromStr, U: std::str::FromStr>() -> (T, U) { let mut s = String::new(); std::io::stdin().read_line(&mut s).ok(); let s = s.trim().split_whitespace().collect::<Vec<&str>>(); (s[0].parse().ok().unwrap(), s[1].parse().ok().unwrap()) } #[allow(dead_code)] fn input_t3<T1: std::str::FromStr, T2: std::str::FromStr, T3: std::str::FromStr>() -> (T1, T2, T3) { let mut s = String::new(); std::io::stdin().read_line(&mut s).ok(); let s = s.trim().split_whitespace().collect::<Vec<&str>>(); (s[0].parse().ok().unwrap(), s[1].parse().ok().unwrap(), s[2].parse().ok().unwrap()) } #[allow(dead_code)] fn input_t4<T1: std::str::FromStr, T2: std::str::FromStr, T3: std::str::FromStr, T4: std::str::FromStr>() -> (T1, T2, T3, T4) { let mut s = String::new(); std::io::stdin().read_line(&mut s).ok(); let s = s.trim().split_whitespace().collect::<Vec<&str>>(); (s[0].parse().ok().unwrap(), s[1].parse().ok().unwrap(), s[2].parse().ok().unwrap(), s[3].parse().ok().unwrap()) } #[allow(dead_code)] fn input_t5<T1: std::str::FromStr, T2: std::str::FromStr, T3: std::str::FromStr, T4: std::str::FromStr, T5: std::str::FromStr>() -> (T1, T2, T3, T4, T5) { let mut s = String::new(); std::io::stdin().read_line(&mut s).ok(); let s = s.trim().split_whitespace().collect::<Vec<&str>>(); (s[0].parse().ok().unwrap(), s[1].parse().ok().unwrap(), s[2].parse().ok().unwrap(), s[3].parse().ok().unwrap(), s[4].parse().ok().unwrap()) } #[allow(dead_code)] fn input_vec<T: std::str::FromStr>() -> Vec<T> { let mut s = String::new(); std::io::stdin().read_line(&mut s).ok(); s.trim().split_whitespace().map(|s| s.parse().ok().unwrap()).collect() }