题目描述
In 2020, AtCoder Inc. with an annual sales of more than one billion yen (the currency of Japan) has started a business in programming education.
One day, there was an exam where a one-year-old child must write a program that prints Hello World, and a two-year-old child must write a program that receives integers A, B and prints A+B.
Takahashi, who is taking this exam, suddenly forgets his age.
He decides to write a program that first receives his age N (1 or 2) as input, then prints Hello World if N=1, and additionally receives integers A, B and prints A+B if N=2.
Write this program for him.
Constraints
- N is 1 or 2.
- A is an integer between 1 and 9 (inclusive).
- B is an integer between 1 and 9 (inclusive).
Input
Input is given from Standard Input in one of the following formats:
1
2
A
B
Output
If N=1, print Hello World; if N=2, print A+B.
Examples
Input
1
Output
Hello World
Input
2
3
5
Output
8
输入格式
见题面
输出格式
见题面