#include <iostream>
#include <cmath>
using namespace std;
#define PI 3.14 
class ShapeCal {
public:
   
    double KoreVolume(double r) {
        return (4.0 / 3.0) * PI * pow(r, 3);
    }

    double koreArea(double r) {
        return 4 * PI * pow(r, 2);
    }

  
    double ostovaneVolume(double r, double height) {
        return PI * pow(r, 2) * height;
    }

    double ostovaneArea(double r, double height) {
        return 2 * PI * r * (r + height);
    }

   
    double coneVolume(double r, double height) {
        return (1.0 / 3.0) * PI * pow(r, 2) * height;
    }

    double coneArea(double r, double height) {
        double l = sqrt(pow(r, 2) + pow(height, 2));
        return PI * r * (r +l);
    }

    
    double cubeVolume(double a) {
        return pow(a, 3);
    }

    static double cubeArea(double a) {
        return 6 * pow(a, 2);
    }
};

int main() {
    double r = 5.0;
    double height = 10.0;
    double a = 4.0;

ShapeCal s; 
cout<<s.cubeVolume(3);
    return 0;
}