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;
using System.Collections.Generic;
using System.Linq;

namespace AtCoderConsole
{
    class Program
    {
        static void Main(string[] args)
        {
            // 標準入力から1行取得
            string input = Console.ReadLine();

            // 年齢を取得
            int age = int.Parse(input);

            // 出力文字列を宣言
            string output = "";

            // 7歳、5歳、3歳のいずれかの場合YES、そうでない場合NO
            if(age == 7 || age == 5 || age == 3)
            {
                output = "YES";
            }
            else
            {
                output = "NO";
            }

            // 標準出力に出力
            Console.WriteLine(output);
        }
    }
}