public static void main ( String [ ] args ) {
  int number = sc . nextInt ( ) ;
  int count = 0 ;
  while ( number > 0 ) {
    int into = sc . nextInt ( ) ;
    int max = sc . nextInt ( ) ;
    if ( ( max - into ) >= 2 ) {
      count ++ ;
    }
    number -- ;
  }
  System . out . println ( count ) ;
}

public static void main ( String [ ] args ) { int number = sc . nextInt ( ) ; int count = 0 ; while ( number > 0 ) { int into = sc . nextInt ( ) ; int max = sc . nextInt ( ) ; if ( ( max - into ) >= 2 ) { count ++ ; } number -- ; } System . out . println ( count ) ; }
(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: (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))) (while_statement condition: (parenthesized_expression (binary_expression left: (identifier) right: (decimal_integer_literal))) body: (block (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)))) (if_statement condition: (parenthesized_expression (binary_expression left: (parenthesized_expression (binary_expression left: (identifier) right: (identifier))) right: (decimal_integer_literal))) consequence: (block (expression_statement (update_expression (identifier))))) (expression_statement (update_expression (identifier))))) (expression_statement (method_invocation object: (field_access object: (identifier) field: (identifier)) name: (identifier) arguments: (argument_list (identifier))))))