Problem Statement

Joisino wants to evaluate the formula "A op B".
Here, A and B are integers, and the binary operator op is either + or -.
Your task is to evaluate the formula instead of her.

Input

The input is given from Standard Input in the following format:
A op B

Output

Evaluate the formula and print the result.

Constraints

• 1≦A,B≦10^9
• op is either + or -.

Sample Input 1

1 + 2

Sample Output 1

3

Since 1 + 2 = 3, the output should be 3.

Sample Input 2

5 - 7

Sample Output 2

-2

见题面 Input 部分

见题面 Output 部分