public static void main ( String [ ] args ) {
  Scanner sc = new Scanner ( System . in ) ;
  String [ ] st = sc . nextLine ( ) . split ( " " ) ;
  sc . close ( ) ;
  int n = Integer . parseInt ( st [ 0 ] ) ;
  int m = Integer . parseInt ( st [ 1 ] ) ;
  n = n >= 12 ? n - 12 : n ;
  double shortHand = ( n * 30 ) + ( m * 0.5 ) ;
  double longHand = m * 6 ;
  double ans = Math . abs ( shortHand - longHand ) ;
  ans = ans > 180 ? Math . abs ( 360 - ans ) : ans ;
  System . out . println ( ans ) ;
}

public static void main ( String [ ] args ) { Scanner sc = new Scanner ( System . in ) ; String [ ] st = sc . nextLine ( ) . split ( " ▁ " ) ; sc . close ( ) ; int n = Integer . parseInt ( st [ 0 ] ) ; int m = Integer . parseInt ( st [ 1 ] ) ; n = n >= 12 ? n - 12 : n ; double shortHand = ( n * 30 ) + ( m * 0.5 ) ; double longHand = m * 6 ; double ans = Math . abs ( shortHand - longHand ) ; ans = ans > 180 ? Math . abs ( 360 - ans ) : ans ; System . out . println ( ans ) ; }
(method_declaration (modifiers) type: (void_type) name: (identifier) parameters: (formal_parameters (formal_parameter type: (array_type element: (type_identifier) dimensions: (dimensions)) name: (identifier))) body: (block (local_variable_declaration type: (type_identifier) declarator: (variable_declarator name: (identifier) value: (object_creation_expression type: (type_identifier) arguments: (argument_list (field_access object: (identifier) field: (identifier)))))) (local_variable_declaration type: (array_type element: (type_identifier) dimensions: (dimensions)) declarator: (variable_declarator name: (identifier) value: (method_invocation object: (method_invocation object: (identifier) name: (identifier) arguments: (argument_list)) name: (identifier) arguments: (argument_list (string_literal))))) (expression_statement (method_invocation object: (identifier) name: (identifier) arguments: (argument_list))) (local_variable_declaration type: (integral_type) declarator: (variable_declarator name: (identifier) value: (method_invocation object: (identifier) name: (identifier) arguments: (argument_list (array_access array: (identifier) index: (decimal_integer_literal)))))) (local_variable_declaration type: (integral_type) declarator: (variable_declarator name: (identifier) value: (method_invocation object: (identifier) name: (identifier) arguments: (argument_list (array_access array: (identifier) index: (decimal_integer_literal)))))) (expression_statement (assignment_expression left: (identifier) right: (ternary_expression condition: (binary_expression left: (identifier) right: (decimal_integer_literal)) consequence: (binary_expression left: (identifier) right: (decimal_integer_literal)) alternative: (identifier)))) (local_variable_declaration type: (floating_point_type) declarator: (variable_declarator name: (identifier) value: (binary_expression left: (parenthesized_expression (binary_expression left: (identifier) right: (decimal_integer_literal))) right: (parenthesized_expression (binary_expression left: (identifier) right: (decimal_floating_point_literal)))))) (local_variable_declaration type: (floating_point_type) declarator: (variable_declarator name: (identifier) value: (binary_expression left: (identifier) right: (decimal_integer_literal)))) (local_variable_declaration type: (floating_point_type) declarator: (variable_declarator name: (identifier) value: (method_invocation object: (identifier) name: (identifier) arguments: (argument_list (binary_expression left: (identifier) right: (identifier)))))) (expression_statement (assignment_expression left: (identifier) right: (ternary_expression condition: (binary_expression left: (identifier) right: (decimal_integer_literal)) consequence: (method_invocation object: (identifier) name: (identifier) arguments: (argument_list (binary_expression left: (decimal_integer_literal) right: (identifier)))) alternative: (identifier)))) (expression_statement (method_invocation object: (field_access object: (identifier) field: (identifier)) name: (identifier) arguments: (argument_list (identifier))))))