AtCoder 250 A

#include <iostream>
#include <cstring>
#include <bits/stdc++.h>
using namespace std;

int main() {

  int n,m,r,c; ///n linii, m coloane
/*
11 12 ... 1m
21 22 ....2m
............
n1 n2 ... nm
*/

  cin>>n>>m>>r>>c;
  if((r==1 &&c==1)||(r==1 && c==m )||(r==n && c==m)||(r==n && c==1)) ///colturile
    cout<<2;
  else if(r==1|| r==n || c==1 || c==m) ///marginea
     cout<<3;
  else
    cout<<4;


    return 0;
  }