public class Circle
{
    static double PI=3.14159265;
    int radius;
    public double circumference()
    {
        return(2*PI*radius);    
        }
    }

public class test3
{
    public static void main(String args[])
    {
        Circle c1=new Circle();
        System.out.print("put in one radius:");
        BufferedReader a=new BufferedReader(new InputStreamReader(System.in));
        String c1.radius=a.readLine();
        Circle c2=new Circle();
        System.out.print("put in another one:");
        BufferedReader b=new BufferedReader(new InputStreamReader(System.in));
        String c2.radius=b.readLine();
        double circum1=c1.circumference();
        double circum2=c2.circumference();
        System.out.println("Circle 1 is "+circum1);
        System.out.println("Circle 2 is "+circum2);
        
        }
    
    }