public static void main ( String [ ] args ) {
  Scanner sc = new Scanner ( System . in ) ;
  double N = sc . nextDouble ( ) ;
  double va = sc . nextDouble ( ) ;
  double vb = sc . nextDouble ( ) ;
  double L = sc . nextDouble ( ) ;
  double y = L ;
  for ( int i = 0 ;
  i < N ;
  i ++ ) {
    y = y / va ;
    y = vb * y ;
  }
  System . out . println ( ( double ) y ) ;
}

public static void main ( String [ ] args ) { Scanner sc = new Scanner ( System . in ) ; double N = sc . nextDouble ( ) ; double va = sc . nextDouble ( ) ; double vb = sc . nextDouble ( ) ; double L = sc . nextDouble ( ) ; double y = L ; for ( int i = 0 ; i < N ; i ++ ) { y = y / va ; y = vb * y ; } System . out . println ( ( double ) y ) ; }
(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: (floating_point_type) declarator: (variable_declarator name: (identifier) value: (method_invocation object: (identifier) name: (identifier) arguments: (argument_list)))) (local_variable_declaration type: (floating_point_type) declarator: (variable_declarator name: (identifier) value: (method_invocation object: (identifier) name: (identifier) arguments: (argument_list)))) (local_variable_declaration type: (floating_point_type) declarator: (variable_declarator name: (identifier) value: (method_invocation object: (identifier) name: (identifier) arguments: (argument_list)))) (local_variable_declaration type: (floating_point_type) declarator: (variable_declarator name: (identifier) value: (method_invocation object: (identifier) name: (identifier) arguments: (argument_list)))) (local_variable_declaration type: (floating_point_type) declarator: (variable_declarator name: (identifier) value: (identifier))) (for_statement init: (local_variable_declaration type: (integral_type) declarator: (variable_declarator name: (identifier) value: (decimal_integer_literal))) condition: (binary_expression left: (identifier) right: (identifier)) update: (update_expression (identifier)) body: (block (expression_statement (assignment_expression left: (identifier) right: (binary_expression left: (identifier) right: (identifier)))) (expression_statement (assignment_expression left: (identifier) right: (binary_expression left: (identifier) right: (identifier)))))) (expression_statement (method_invocation object: (field_access object: (identifier) field: (identifier)) name: (identifier) arguments: (argument_list (cast_expression type: (floating_point_type) value: (identifier)))))))