public static void main ( String [ ] args ) {
  Scanner scanner = new Scanner ( System . in ) ;
  String line = scanner . nextLine ( ) ;
  StringTokenizer stringTokenizer = new StringTokenizer ( line ) ;
  int k = Integer . parseInt ( stringTokenizer . nextToken ( ) ) ;
  int r = Integer . parseInt ( stringTokenizer . nextToken ( ) ) ;
  for ( int i = 1 ;
  i < 100000 ;
  i ++ ) {
    int result = ( k * i ) % 10 ;
    if ( result == 0 || result == r ) {
      System . out . println ( i ) ;
      return ;
    }
  }
}

public static void main ( String [ ] args ) { Scanner scanner = new Scanner ( System . in ) ; String line = scanner . nextLine ( ) ; StringTokenizer stringTokenizer = new StringTokenizer ( line ) ; int k = Integer . parseInt ( stringTokenizer . nextToken ( ) ) ; int r = Integer . parseInt ( stringTokenizer . nextToken ( ) ) ; for ( int i = 1 ; i < 100000 ; i ++ ) { int result = ( k * i ) % 10 ; if ( result == 0 || result == r ) { System . out . println ( i ) ; return ; } } }
(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: (type_identifier) declarator: (variable_declarator name: (identifier) value: (method_invocation object: (identifier) name: (identifier) arguments: (argument_list)))) (local_variable_declaration type: (type_identifier) declarator: (variable_declarator name: (identifier) value: (object_creation_expression type: (type_identifier) arguments: (argument_list (identifier))))) (local_variable_declaration type: (integral_type) declarator: (variable_declarator name: (identifier) value: (method_invocation object: (identifier) name: (identifier) arguments: (argument_list (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 (method_invocation object: (identifier) name: (identifier) arguments: (argument_list)))))) (for_statement init: (local_variable_declaration type: (integral_type) declarator: (variable_declarator name: (identifier) value: (decimal_integer_literal))) condition: (binary_expression left: (identifier) right: (decimal_integer_literal)) update: (update_expression (identifier)) body: (block (local_variable_declaration type: (integral_type) declarator: (variable_declarator name: (identifier) value: (binary_expression left: (parenthesized_expression (binary_expression left: (identifier) right: (identifier))) right: (decimal_integer_literal)))) (if_statement condition: (parenthesized_expression (binary_expression left: (binary_expression left: (identifier) right: (decimal_integer_literal)) right: (binary_expression left: (identifier) right: (identifier)))) consequence: (block (expression_statement (method_invocation object: (field_access object: (identifier) field: (identifier)) name: (identifier) arguments: (argument_list (identifier)))) (return_statement)))))))