// Regular Angles
// n is number of sides or angles
import tio.*;
public class Regular {
  public static void main(String[] args) {
    int sides;
    double angle;
     
    //either 10 roots or enter 0
    System.out.println("Enter a number of sides 0:");
    sides = Console.in.readInt();
    while (sides != 0) {
     
      System.out.println("the angle is " + 180.0 * (sides-2)/sides);
      System.out.println("Enter a number of sides 0:");
      sides = Console.in.readInt();
    }
    System.out.println("That's All!");
  }
}