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;
using System.Text;
using static System.Console;
using static System.Math;

// 

public class Program_ABC114_A // ←Class名変更！！
{
    public static void Main()
    {
        var r = Ri();

        if (r == 3)
        {
            WriteLine($"YES");
        }
        else if (r == 5)
        {
            WriteLine($"YES");

        }
        else if (r == 7)
        {
            WriteLine($"YES");

        }
        else
        {
            WriteLine("NO");
        }



    } // Main

    public static string Rs() { return ReadLine(); }
    public static int Ri() { return int.Parse(ReadLine()); }
    public static long Rl() { return long.Parse(ReadLine()); }
    public static int[] Ria() { return Array.ConvertAll(ReadLine().Split(' '), int.Parse); }
    public static long[] Rla() { return Array.ConvertAll(ReadLine().Split(' '), long.Parse); }
    public static char[] Rca() { return ReadLine().ToCharArray(); }
}     // Class