package com.company;

import java.util.Scanner;

public class Main {

    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);

        String a = scanner.nextLine();
        double b = Double.parseDouble(scanner.nextLine());
        double c = Double.parseDouble(scanner.nextLine());
        double square = b * b;
        double rectangle = b * c;
        double circle = b * b;
        double triangle = (b * c)/2;

        if (a == "square") {
            System.out.println(square);
        }else if(a == "rectangle"){
            System.out.println(rectangle);
        }else if(a == "circle"){
            System.out.println(circle);
        }else if(a == "triangle"){
            System.out.println(triangle);



        }
    }
}