[백준] 1085번

import java.util.*;
import java.io.*;
import java.math.*;

public class Main {
   public static void main(String[] args) throws IOException{
      BufferedReader br = new BufferedReader(new InputStreamReader(System.in));

      StringTokenizer st = new StringTokenizer(br.readLine(), " ");

      int x = Integer.parseInt(st.nextToken());
      int y = Integer.parseInt(st.nextToken());
      int w = Integer.parseInt(st.nextToken());
      int h = Integer.parseInt(st.nextToken());

      int x_min = Math.min(x, w - x);
      int y_min = Math.min(y, h - y);
      System.out.println(Math.min(x_min, y_min));
   }
}