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.
-----Sample Input-----
1 + 2
-----Sample Output-----
3
Since 1 + 2 = 3, the output should be 3.
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