Problem:
Score : 100 points

Problem Statement

You are given three integers, A, B and C.

Among them, two are the same, but the remaining one is different from the rest.

For example, when A=5,B=7,C=5, A and C are the same, but B is different.

Find the one that is different from the rest among the given three integers.

Constraints

-100 \leq A,B,C \leq 100

A, B and C are integers.

The input satisfies the condition in the statement.

Input

Input is given from Standard Input in the following format:

A B C

Output

Among A, B and C, print the integer that is different from the rest.

Sample Input 1

5 7 5

Sample Output 1

7

This is the same case as the one in the statement.

Sample Input 2

1 1 7

Sample Output 2

7

In this case, C is the one we seek.

Sample Input 3

-100 100 100

Sample Output 3

-100

Solution in C# (Mono 4.6.2.0) (judge verdict: Accepted)

using System;

class ABC075A
{
	static public void Main(string[] args)
	{
		int A,B,C;
		string[] vals = Console.ReadLine().Split(' ');
		A = int.Parse(vals[0]);
		B = int.Parse(vals[1]);
		C = int.Parse(vals[2]);

		if(A == B)
		{
			Console.WriteLine(C);
		}
		else if(A == C)
		{
			Console.WriteLine(B);
		}
		else if(B == C)
		{
			Console.WriteLine(A);
		}
	}
}