using System;

public class Program

{

    public static void Main()

    {   

        Console.WriteLine("Soal 1 : ");

        Console.WriteLine("Masukkan maksimal nilai : ");

        int max = int.Parse(Console.ReadLine());

        int batas = 10;

        int row = (int) Math.Ceiling((double) max/batas);

        Console.WriteLine("Total Row : "+row);

        for(int i=0;i<row;i++){

            for(int x=1;x<=batas;x++){

                if(i % 2 == 0){

                    int count = (i*batas)+x;

                    if(count <= max){

                        Console.Write(count+"\t");

                    }else {

                        Console.Write("\t");

                    }

                }else {

                    int count = (i*batas)+(batas+1-x);

                    if(count <= max){

                        Console.Write(count+"\t");

                    }else {

                        Console.Write("\t");

                    }

                }

            }

            Console.WriteLine();

        }

        Console.WriteLine();

        Console.WriteLine();

        Console.WriteLine();

        Console.WriteLine("Soal 2 : ");

        bool ulangi = true;

        while(ulangi){

            Console.WriteLine("Masukkan nilai tugas : ");

            int tugas = int.Parse(Console.ReadLine());

            Console.WriteLine("Masukkan nilai UTS : ");

            int uts = int.Parse(Console.ReadLine());

            Console.WriteLine("Masukkan nilai UAS : ");

            int uas = int.Parse(Console.ReadLine());

            double nilaiAkhir = (0.3*tugas)+(0.3*uts)+(0.4*uas);

            if(nilaiAkhir >= 90 && nilaiAkhir <= 100){

                Console.WriteLine("Grade A");

            }else if(nilaiAkhir >= 75 && nilaiAkhir <= 89){

                Console.WriteLine("Grade B");

            }else if(nilaiAkhir >= 60 && nilaiAkhir <= 74){

                Console.WriteLine("Grade C");

            }else if(nilaiAkhir >= 50 && nilaiAkhir <= 59){

                Console.WriteLine("Grade D");

            }else if(nilaiAkhir >= 0 && nilaiAkhir <= 49){

                Console.WriteLine("Grade E");

            }else {

                Console.WriteLine("Grade nilai tidak dapat ditentukan");

            }

            Console.WriteLine("");

            Console.WriteLine("Lagi?(T/Y) : ");

            String isUlangi = Console.ReadLine();

            Console.WriteLine("");

            ulangi = isUlangi == "Y" || isUlangi == "y";

        }

        Console.WriteLine();

        Console.WriteLine();

        Console.WriteLine();

        Console.WriteLine("Soal 3 => Menghitung volume bola : ");

        Console.WriteLine("Masukkan nilai diameter bola : ");

        double jari = int.Parse(Console.ReadLine())/2;

        Console.WriteLine("Jari jari bola : "+jari);

        double phi = 3.14159265358979;

        Console.WriteLine("Volume bola = "+(4/3*phi*jari*jari*jari));

    }

}