#include <iostream>
#include <algorithm>
using namespace std;

int main() {
    int n, x, y, v;
    cin >> n >> x >> y >> v;
    
    int tvrdina[n][n];
    for(int i = 0; i < n; i++) {
        for(int j = 0; j < n; j++) {
            if(i % 2 == 0) {
                if(j % 2 == 0) {
                    tvrdina[i][j] = 0;
                }
                else {
                    tvrdina[i][j] = 1;
                }
            }
            else {
                if(j % 2 == 0) {
                    tvrdina[i][j] = 1;
                }
                else {
                    tvrdina[i][j] = 0;
                }
            }
        }
    }
    
    int titanik[n][n];
    for(int i = 0; i < n; i++) {
        for(int j = 0; j < n; j++) {
            if(j < n - i) {
                titanik[i][j] = 1;
            }
            else {
                titanik[i][j] = 0;
            }
        }
    }
    
    if(v == titanik[y][x] and v == tvrdina[y][x]) {
        cout << 3 << endl;
    }
    else if(v == tvrdina[y][x]) {
        cout << 1 << endl;
    }
    else if(v == titanik[y][x]) {
        cout << 2 << endl;
    }
    else {
        cout << 4 << endl;
    }
    return 0;
}