///////////////////////////////////
/// Simulation MonteCarloMethod.
/// By S.H
///////////////////////////////////

using System;

namespace ConsoleApp2 {

    class Program {

        static void Main(string[] args) {
            
            Random Ra = new System.Random();

            Console.WriteLine("Simulation MonteCarloMethod.\r\nMode Select Output...1 , NoOutput...2");
            int mode = int.Parse(Console.ReadLine());

            if (mode == 2) {
                NoOut();
            }
            else Output();
        }


        static void Output() {

            Random Ra = new System.Random();
            ulong cnt = 0;
            double X, Y;
            ulong c = 0;

            while (true) {

                X = Ra.NextDouble();
                Y = Ra.NextDouble();

                if (X * X + Y * Y < 1.0) c++;
                Console.WriteLine(cnt + " " + 4.0 * c / cnt + "\r\n\r\n\r\n");

                cnt++;

            }
        }

        static void NoOut() {

            Random Ra = new System.Random();
            ulong max = 10L;
            ulong cnt = 0;
            ulong c = 0;
            double X, Y;
            
            DateTime dt = DateTime.Now;

            while (true) {

                dt = DateTime.Now;
                Console.WriteLine("StartTime " + dt);
                Console.WriteLine("Loop " + max);

                while (true) {
                    X = Ra.NextDouble();
                    Y = Ra.NextDouble();

                    if (X * X + Y * Y < 1.0) c++;

                    if (cnt == max) {
                        max *= 10;
                        Console.WriteLine(4.0 * c / cnt + "\r\n");
                        break;
                    }
                    cnt++;
                }

            } // MAINLOOP
        }

    }
}