#include <iostream>

#include<iomanip>

using namespace std;

double Vol(double laen, double brei=100, double hoeh=100);

void main( )

{

double laenge=100;

double breite=70;

double hoehe=50;

cout.precision(0);

cout<<fixed<<Vol(laenge)<<endl;

cout<<Vol(laenge, breite)<<endl;

cout<<Vol(laenge, breite, hoehe)<<endl;

}

double Vol(double laen, double brei, double hoeh)

{

return laen*brei*hoeh;

}