using System;

public class Program

{

    public static void Main()

    {

//  площ на фигура:

        // деклариране на числото Пи 

        double pi = Math.PI;

        Console.Write("A = ");int A = int.Parse(Console.ReadLine());

        Console.Write("B = ");int B = int.Parse(Console.ReadLine());

    Console.Write("R1 = ");int R1 = int.Parse(Console.ReadLine());Console.Write("V1 = ");int V1 = int.Parse(Console.ReadLine());

    Console.Write("R2 = ");int R2 = int.Parse(Console.ReadLine());Console.Write("V2 = ");int V2 = int.Parse(Console.ReadLine());

    Console.Write("R3 = ");int R3 = int.Parse(Console.ReadLine());Console.Write("V3 = ");int V3 = int.Parse(Console.ReadLine());

    Console.Write("R4 = ");int R4 = int.Parse(Console.ReadLine());Console.Write("V4 = ");int V4 = int.Parse(Console.ReadLine());

        double S1 = R1*R1*V1 - pi*R1*R1/4;

        double S2 = R2*R2*V2 - pi*R2*R2/4;

        double S3 = R3*R3*V3 - pi*R3*R3/4;

        double S4 = R4*R4*V4 - pi*R4*R4/4;

    double S = A * B - S1 - S2 - S3 -S4;

//------ Резултати

        Console.WriteLine("пи=" + "{0:F2}", + pi);

   Console.Write("        S1=" + "{0:F2}", + S1);

        Console.Write(" | S2=" + "{0:F2}", + S2);

        Console.Write(" | S3=" + "{0:F2}", + S3);

    Console.WriteLine(" | S4=" + "{0:F2}", + S4);

         Console.WriteLine("S=" + "{0:F2}", + S);

    }

}