1000 A+B problem

复习不知道该复习什么了，也快暑假找工作了，转眼就大四了，总得找点事做，刷题吧，从北大ｏｊ里面一道一道的来吧，不知道自己能刷到哪里。

Description

Calculate a+b

Input

Two integer a,b (0<=a,b<=10)

Output

Output a+b

Sample Input

1 2

Sample Output

3

Hint

Q: Where are the input and the output? 
     
A: Your program shall always read input from stdin (Standard Input) and write output to stdout (Standard Output). For example, you can use 'scanf' in C or 'cin' in C++ to read from stdin, and use 'printf' in C or 'cout' in C++ to write to stdout. 

You shall not output any extra data to standard output other than that required by the problem, otherwise you will get a "Wrong Answer". 

User programs are not allowed to open and read from/write to files. You will get a "Runtime Error" or a "Wrong Answer"if you try to do so