Problem:
Score : 100 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.

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

Constraints

1 ≤ X ≤ 9

X is an integer.

Input

Input is given from Standard Input in the following format:

X

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

See you next year.

Solution in C# (Mono 4.6.2.0) (judge verdict: Accepted)

using System;
class Program
{
 	static void Main(string[] args)
 	{
 		// 整数の入力
 		int X = int.Parse(Console.ReadLine());
 		// スペース区切りの整数の入力
 		if (X == 7 || X == 5 || X == 3) {
  			Console.WriteLine("YES");
		}
  		else {
        	Console.WriteLine("NO");
        }
    }
}