/* package whatever; // don't place package name! */

import java.util.*;
import java.lang.*;
import java.io.*;

/* Name of the class has to be "Main" only if the class is public. */
class Ideone
{
	
public static double pow(double x, int n) {
    if(n == 0)
        return 1;
    double y = 1;
    while (n > 1) {
        if (n%2 == 1) {
            y *= x;
        }
        x *= x;
        n /= 2;
    }
    return x*y;
}	
	
	
	public static void main (String[] args) throws java.lang.Exception
	{
		System.out.println(pow(2.0, 0));
		System.out.println(pow(2.0, 1));
		System.out.println(pow(2.0, 2));
		System.out.println(pow(2.0, 3));
		System.out.println(pow(2.0, 4));
		System.out.println(pow(2.0, 5));
	}
}