import java.util.Scanner;
public class Sphere {
public static void main
(String[] args
) { Scanner input
=new Scanner
(System.
in); float a=input.nextFloat();
float b
= (float) (3.14159*Math.
pow(a,
3)*(4.0/3));
System.
out.
printf("VOLUME = %.3f\n",b
);
input.close();
}
}
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