public class Demonstrate {
 public static void main (String argv[]) {
  System.out.println(powerOf2(4));
 }
 public static int powerOf2 (int n) {
  int counter, result = 1;
  for (counter = n; counter != 0; counter = counter - 1) {
    result = 2 * result;
  }
  return result;
 }
}