import java.io.*;

class Soucet {
	static double a, b, c;
	static double p;
	
	public static void main (String [] arg){

		// Zadani hodnot a,b,c
		System.out.print("Zadej hodnotu a: ");
		a = VstupData.ctiDouble();
		System.out.print("Zadej hodnotu b: ");
		b = VstupData.ctiDouble();
		System.out.print("Zadej hodnotu c: ");
		c = VstupData.ctiDouble();
		
		// Novy radek
		System.out.println();
		
		// Klasicky prumer
		p = (a+b+c)/3;
		System.out.println("klasicky prumer = " + p);

		// Geometricky prumer		
		p = Math.pow(a*b*c,1./3.);
		System.out.println("geometricky prumer = " + p);
		
		// Kvadraticky prumer
		p = 1/Math.sqrt(3)*Math.sqrt(Math.pow(a,2) + Math.pow(b,2) + Math.pow(c,2));
		System.out.println("kvadraticky prumer = " + p);
	}
	
}