import java.util.*;
public class Metode3{
	static void plKr(double r){  //ploščina Kroga
		double pl = Math.PI*r*r;
		System.out.println(pl);
		System.out.printf("Ploscina kroga je %.2f",pl);
	}
	
	public static void main(String[]args){
		Scanner sc = new Scanner(System.in);
		System.out.print("Vnesi r kroga: ");
		double r = sc.nextDouble();
		//klic metode
		plKr(r);
	}
}