AtCoder BeginnerContest 114 A-753

Time Limit: 2 sec / Memory Limit: 1024 MB

Score : 100100 points

Problem Statement

Shichi-Go-San (literally "Seven-Five-Three") is a traditional event in a certain country to celebrate the growth of seven-, five- and three-year-old children.

七五三（字面意思是“七五三”）是在某个国家庆祝七、五、三岁儿童成长的传统活动。

Takahashi is now XX years old. Will his growth be celebrated in Shichi-Go-San this time?

Constraints

• 1≤X≤91≤X≤9
• XX is an integer.

Input

Input is given from Standard Input in the following format:

XX

Output

If Takahashi's growth will be celebrated, print YES; if it will not, print NO.

Sample Input 1 

5

Sample Output 1 

YES

The growth of a five-year-old child will be celebrated.

Sample Input 2 

6

Sample Output 2 

NO

分析：这是道非常简单的题目，只要判断一下输入是否为3、5、7即可，用If进行条件判断，若为3、5、7其中任意一个，就输出YES否则输出NO。

代码：

#include<iostream>

#include<cstdio>

#include<algorithm>

using namespace std;

int main(){

int n;

cin>>n;

if(n == 5 || n == 3 || n == 7)

cout<<"YES"<<endl;

else

cout<<"NO"<<endl;

return 0;

}