import java.io.*;
class tretiodmo {
	static double x1, x2, a, eps=0.000000000000001;
	
	public static void main (String [] arg){
		a=26;
		x2 = a;
		do {
			x1 = x2;		
			x2 = x1 + (a / (Math.pow (x1,2)) - x1) / 3;
		}while (Math.abs(x2 - x1) > eps) ;
		
		System.out.println("treti = " + x2 + "   treti mocnina " + Math.pow(x2,3));
	}
	
}