class Program
    {
        static void Main(string[] args)
        {
            DoSomething();
            Console.Read();
        }

        public static async Task DoSomething()
        {
            Console.WriteLine("DoSomethinbg started");
            await MathOpertion();
            GenerateData();
            Console.WriteLine("DoSomethinbg completed");
        }

        public static async Task MathOpertion()
        {
            Console.WriteLine("MathOperation started");
            await GetData();
            Console.WriteLine("MathOperation completed");
        }

        public static void GenerateData()
        {
            Console.WriteLine("GenerateData started");
            Thread.Sleep(1000);
            Console.WriteLine("GenerateData completed");
        }

        public static async Task GetData()
        {
            Console.WriteLine("GetData started");
            await Task.Delay(3000);
            Console.WriteLine("GetData completed");
        }
    }