using System;

public class Program

{

    public static void Main()

    {

        Console.WriteLine(CreateReferenceNo(10806,1,11));

    }

    public static string CreateReferenceNo(int agentId, int serviceOperationId, int platformProposalId)

{

    return $"{agentId}_{DateTime.Now:yyyyMMddHHmmssfff}{Guid.NewGuid().ToString("N").Substring(0, 5)}_{platformProposalId}_{serviceOperationId}";

}

}