ACM Q579

import java.util.Scanner;
public class Q579 {
  public static void main(String args[]) {
    Scanner cin = new Scanner(System.in);
    while(cin.hasNextLine() ){
      String  inputLine = cin.nextLine();
      String[] tokens = inputLine.split(":");
      float h = Float.parseFloat(tokens[0]);
      float m = Float.parseFloat(tokens[1]);
      if(h==0 && m==0){
      break;
      }
      float angle = (float) Math.abs(h * 30 + m /2 - m * 6);
      if( angle > 180){
      System.out.printf("%.3f\n",360-angle);
      }else{
      System.out.printf("%.3f\n",angle);
      }
    }

  }
}