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 Java8 (OpenJDK 1.8.0) (judge verdict: Accepted)

// package app;

import java.util.Arrays;
import java.util.Scanner;
import java.util.stream.Stream;

public class Main {

    public static void main(final String[] args) throws Exception {
        final Scanner sc = new Scanner(System.in);

        // final String N = sc.next();
        final int A = sc.nextInt();
        final int B = sc.nextInt();
        final int C = sc.nextInt();
        // final int N = sc.nextInt();
        // final int D = sc.nextInt();
        // System.out.println();
        int result = 0;
        if (A == B){
            result = C;
        } else if(A == C) {
            result = B;
        } else {
            result = A;
        }

        System.out.println(result);

        // System.out.println(A <= X && A + B >= X ? "YES" : "NO");

    }
}