101120: [AtCoder]ABC112 A - Programming Education

Problem Statement

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 $A+B$.

Sample Input 1

1

Sample Output 1

Hello World

As $N=1$, Takahashi is one year old. Thus, we should print Hello World.

Sample Input 2

2
3
5

Sample Output 2

8

As $N=2$, Takahashi is two years old. Thus, we should print $A+B$, which is $8$ since $A=3$ and $B=5$.