Programming Education

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.

输入格式

Input is given from Standard Input in one of the following formats:
1

2 $A$ $B$

输出格式

If $N=1$, print $Hello World$; if $N=2$, print $A+B$.

1

Hello World

2
3
5

8

提示

$N$ is $1$ or $2$. $A$ is an integer between $1$ and $9$ (inclusive). $B$ is an integer between $1$ and $9$ (inclusive).As $N=1$, Takahashi is one year old. Thus, we should print $Hello World$.
As $N=2$, Takahashi is two years old. Thus, we should print $A+B$, which is $8$ since $A=3$ and $B=5$.

标签: AtCoder|abc112A

来源

AtCoder|abc112A