v na cilindur

using System;
using System.Linq;
using System.Collections.Generic;

public class Program
{
    public static void Main()
    {
		string[] input = Console.ReadLine().Split(',');
		double r1 = double.Parse(input[0])/10;
		double h1 = double.Parse(input[1])/10;
		double r2 = double.Parse(input[2])/10;
		double h2 = double.Parse(input[3])/10;

		double V1 = Math.PI * r1 * r1 * h1;
		double V2 = Math.PI * r2 * r2 * h2;

		Console.WriteLine("{0:F2}", Math.Max(V1, V2));
    }
}