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import java.util.Scanner;
class Main {
public static void main(String[] args) {
// TODO Auto-generated method stub
final double PI = 3.1415927;
Scanner read = new Scanner(System.in);
while(read.hasNextDouble()) {
double R = read.nextDouble();
System.out.printf("%.3f", 4.0/3.0*PI*Math.pow(R, 3));
System.out.println();
}
read.close();
}
}