Problem:
Score : 300 points

Problem Statement

You are given three integers A, B and C. Find the minimum number of operations required to make A, B and C all equal by repeatedly performing the following two kinds of operations in any order:

Choose two among A, B and C, then increase both by 1.

Choose one among A, B and C, then increase it by 2.

It can be proved that we can always make A, B and C all equal by repeatedly performing these operations.

Constraints

0 \leq A,B,C \leq 50

All values in input are integers.

Input

Input is given from Standard Input in the following format:

A B C

Output

Print the minimum number of operations required to make A, B and C all equal.

Sample Input 1

2 5 4

Sample Output 1

2

We can make A, B and C all equal by the following operations:

Increase A and C by 1. Now, A, B, C are 3, 5, 5, respectively.

Increase A by 2. Now, A, B, C are 5, 5, 5, respectively.

Sample Input 2

2 6 3

Sample Output 2

5

Sample Input 3

31 41 5

Sample Output 3

23

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

import java.util.Scanner;

import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;

public class Main{
    public static void main(String[] args){
			Scanner sc = new Scanner(System.in);
			int[] list = {sc.nextInt(), sc.nextInt(), sc.nextInt()};
			Arrays.sort(list);
			int times = 0;
			while(list[2]<=52){
				if(list[0]==list[2]&&list[0]==list[1]){
					break;
				}
				times++;
				if(list[1]!=list[2]){
					list[0]++;
					list[1]++;
				}else{
					list[0]=list[0]+2;
				}
				Arrays.sort(list);
			}
			System.out.println(times);
    }
}