public static void main ( String [ ] args ) {
  Scanner scanner = new Scanner ( System . in ) ;
  String [ ] line = scanner . nextLine ( ) . split ( " " , 2 ) ;
  int n = Integer . parseInt ( line [ 0 ] ) ;
  int m = Integer . parseInt ( line [ 1 ] ) ;
  double n60 = ( ( double ) ( n % 12 ) + ( ( double ) m / 60.0 ) ) * 5.0 ;
  double diff = Math . abs ( n60 - ( double ) m ) ;
  if ( diff > 30.0 ) {
    diff = 60.0 - diff ;
  }
  System . out . println ( 6.0 * diff ) ;
}

public static void main ( String [ ] args ) { Scanner scanner = new Scanner ( System . in ) ; String [ ] line = scanner . nextLine ( ) . split ( " ▁ " , 2 ) ; int n = Integer . parseInt ( line [ 0 ] ) ; int m = Integer . parseInt ( line [ 1 ] ) ; double n60 = ( ( double ) ( n % 12 ) + ( ( double ) m / 60.0 ) ) * 5.0 ; double diff = Math . abs ( n60 - ( double ) m ) ; if ( diff > 30.0 ) { diff = 60.0 - diff ; } System . out . println ( 6.0 * diff ) ; }
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