#include<bits/stdc++.h> 
using namespace std; 
int main() 
{ 
  int h,w;
  cin>>h>>w;
  int r,c;
  cin>>r>>c;
  int res=0;
  if(r-1>=1) res++;
  if(r+1<=h) res++;
  if(c-1>=1) res++; 
  if(c+1<=w) res++;
  cout<<res; 
  return 0;
}