using System;
using System.Linq.Expressions;
using System.Collections.Generic;
using System.Linq;
using System.Text.RegularExpressions;

public class Test
{
	public static void Main()
	{
		String[] strings = {"4,78,6", "2,6,24", "31", "30"};
        foreach (string s in strings)
        {   
            Console.WriteLine("'{0}': {1}", s, isMatch(s));   
        }
	}
	static Boolean isMatch(string s) {
        string pattern = @"^(?:[1-9]|[12]\d|30)(?:,(?:[1-9]|[12]\d|30))*$";
        List<String> a = s.Split(',').ToList();            
        return Regex.Match(s, pattern).Success && a.Count == a.Distinct().Count();
    }
}