#include <stdio.h>
main()
{
	#define PI 3.14159
	double r,a;
	int i;
	
	printf("radius (HaNKeI) = ");
	scanf("%lf",&r);

	printf("1 : EN No GaIShuU \n");
	printf("2 : EN No MeNSeKi \n");
	printf("3 : KyuU No MeNSeKi \n");
	printf("4 : KyuU No TaISeKi \n");
	scanf("%d",&i);

	switch(i){
	case 1:
		a=2.0*PI*r; break;
	case 2:
		a=PI*r*r; break;
	case 3:
		a=4.0*PI*r*r; break;
	case 4:
		a=(4.0/3.0)*PI*r*r*r; break;
	default:
		a=0;
	}
	printf("KoTaE Ha %lf DeSu.\n",a);
}