public static void main ( String [ ] args ) {
  Scanner sc = new Scanner ( System . in ) ;
  int k = sc . nextInt ( ) ;
  int r = sc . nextInt ( ) ;
  int total = 1 ;
  int total_temp = 0 ;
  while ( true ) {
    total_temp = total * k ;
    if ( total_temp % 10 == 0 || total_temp % 10 == r ) {
      break ;
    }
    else {
      total ++ ;
    }
  }
  System . out . println ( total ) ;
}

public static void main ( String [ ] args ) { Scanner sc = new Scanner ( System . in ) ; int k = sc . nextInt ( ) ; int r = sc . nextInt ( ) ; int total = 1 ; int total_temp = 0 ; while ( true ) { total_temp = total * k ; if ( total_temp % 10 == 0 || total_temp % 10 == r ) { break ; } else { total ++ ; } } System . out . println ( total ) ; }
(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: (integral_type) declarator: (variable_declarator name: (identifier) value: (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)))) (local_variable_declaration type: (integral_type) declarator: (variable_declarator name: (identifier) value: (decimal_integer_literal))) (local_variable_declaration type: (integral_type) declarator: (variable_declarator name: (identifier) value: (decimal_integer_literal))) (while_statement condition: (parenthesized_expression (true)) body: (block (expression_statement (assignment_expression left: (identifier) right: (binary_expression left: (identifier) right: (identifier)))) (if_statement condition: (parenthesized_expression (binary_expression left: (binary_expression left: (binary_expression left: (identifier) right: (decimal_integer_literal)) right: (decimal_integer_literal)) right: (binary_expression left: (binary_expression left: (identifier) right: (decimal_integer_literal)) right: (identifier)))) consequence: (block (break_statement)) alternative: (block (expression_statement (update_expression (identifier))))))) (expression_statement (method_invocation object: (field_access object: (identifier) field: (identifier)) name: (identifier) arguments: (argument_list (identifier))))))