Problem:
Score : 200 points

Problem Statement

Alice and Bob are controlling a robot. They each have one switch that controls the robot.

Alice started holding down her button A second after the start-up of the robot, and released her button B second after the start-up.

Bob started holding down his button C second after the start-up, and released his button D second after the start-up.

For how many seconds both Alice and Bob were holding down their buttons?

Constraints

0≤A<B≤100

0≤C<D≤100

All input values are integers.

Input

Input is given from Standard Input in the following format:

A B C D

Output

Print the length of the duration (in seconds) in which both Alice and Bob were holding down their buttons.

Sample Input 1

0 75 25 100

Sample Output 1

50

Alice started holding down her button 0 second after the start-up of the robot, and released her button 75 second after the start-up.

Bob started holding down his button 25 second after the start-up, and released his button 100 second after the start-up.

Therefore, the time when both of them were holding down their buttons, is the 50 seconds from 25 seconds after the start-up to 75 seconds after the start-up.

Sample Input 2

0 33 66 99

Sample Output 2

0

Alice and Bob were not holding their buttons at the same time, so the answer is zero seconds.

Sample Input 3

10 90 20 80

Sample Output 3

60

Solution in Java8 (OpenJDK 1.8.0) (judge verdict: Accepted)

import java.util.Scanner;
import java.io.*;
import java.util.*;

public class Main{
    public static void main(String args[]){
        Scanner scan_A = new Scanner(System.in);
        int a = scan_A.nextInt();
        int b = scan_A.nextInt();
        int c = scan_A.nextInt();
        int d = scan_A.nextInt();
        int ans;

        int max = Math.max(a,c);
        int min = Math.min(b,d);
        int count = min -max;
        ans = Math.max(0, count);
        /* if(a<c && b<d && b<= c||c<a && b<d && b<=a ||a<c && d<b && d <= c ||c<a && d<b && d<=a){
            ans = 0;
        }
            else if(a<c && b<d && c<d){
                ans = b-c;
            }else if(c<a && b<d && a<d){
                ans = b-a;
            }else if(a<c && d<b && c<b){
                ans = d-c;
            }else if(c<a && d<b && a<b){
                ans = d-a;
            }
        */    
            System.out.println(ans);
        
        
    }

}