题目描述
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.
Constraints
- 1≦A,B≦10^9
- op is either
+or-.
Input
The input is given from Standard Input in the following format:
A op B
Output
Evaluate the formula and print the result.
Examples
Input
1 + 2
Output
3
Input
5 - 7
Output
-2
输入格式
见题面
输出格式
见题面
样例输入
1 + 2
样例输出
3