Makes no sense

import java.util.Scanner;

public class SumOfThePowers {

    public static void main(String[] args) {
        Scanner reader = new Scanner(System.in);

        int i = 1;

        System.out.println("Type a number: ");
        int exp = Integer.parseInt(reader.nextLine());
        int result = (int)Math.pow(2, exp);

        while (i <= exp) {
            Math.pow(2, i);
            i++;
        }
        System.out.println("The result is " + result);
    }
}