import java.util.Scanner;

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

        float laturaPatrat=Float.parseFloat(scanner.nextLine());
        float razaCerc = Float.parseFloat(scanner.nextLine());
        float latimeDreptunghi = Float.parseFloat(scanner.nextLine());
        float lungimeDreptunghi = Float.parseFloat(scanner.nextLine());
        int ok=0;
        if(type.equals("square")) {
            System.out.printf("%.2f",laturaPatrat * laturaPatrat);
            ok=1;
        }
        else{
            if(type.equals("rectangle")) {
                System.out.printf("%.2f",latimeDreptunghi * lungimeDreptunghi);
                ok=1;
            }
        }
        if(type.equals("circle")) {
            System.out.printf("%.2f",Math.PI * razaCerc * razaCerc);
            ok = 1;
        }
        if(ok==0)
            System.out.println("Unknown figure");
    }
}