Contest Duration: ~ (local time) (100 minutes) Back to Home
A - One out of Three /

Time Limit: 2 sec / Memory Limit: 256 MB

### 問題文

3 つの整数 A,B,C が与えられます。
A,B,C のうち 2 つは 同じ整数であり、残りの 1 つだけ異なる整数です。

3 つの整数のうち、1 つだけ異なる整数を求めてください。

### 制約

• -100≦A,B,C≦100
• A,B,C は整数
• 入力は問題文の条件を満たす

### 入力

A B C


### 出力

A,B,C のうち、1 つだけ異なる整数を出力せよ。

### 入力例 1

5 7 5


### 出力例 1

7


### 入力例 2

1 1 7


### 出力例 2

7


この場合は、C が求める整数です。

### 入力例 3

-100 100 100


### 出力例 3

-100


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