public static void main ( String [ ] args ) {
  Scanner sc = new Scanner ( System . in ) ;
  int R = sc . nextInt ( ) ;
  int D = sc . nextInt ( ) ;
  int n = sc . nextInt ( ) ;
  int tot = 0 ;
  int d = R - D ;
  while ( n -- > 0 ) {
    int x = sc . nextInt ( ) ;
    x = Math . abs ( x ) ;
    int y = sc . nextInt ( ) ;
    y = Math . abs ( y ) ;
    int r = sc . nextInt ( ) ;
    if ( 2 * r <= R - d ) {
      double f = max ( x , y ) ;
      if ( ( f <= R && f >= d ) ) {
        if ( ( R - f >= r && f - d >= r ) ) {
          tot ++ ;
        }
      }
    }
  }
  System . out . println ( tot ) ;
}

public static void main ( String [ ] args ) { Scanner sc = new Scanner ( System . in ) ; int R = sc . nextInt ( ) ; int D = sc . nextInt ( ) ; int n = sc . nextInt ( ) ; int tot = 0 ; int d = R - D ; while ( n -- > 0 ) { int x = sc . nextInt ( ) ; x = Math . abs ( x ) ; int y = sc . nextInt ( ) ; y = Math . abs ( y ) ; int r = sc . nextInt ( ) ; if ( 2 * r <= R - d ) { double f = max ( x , y ) ; if ( ( f <= R && f >= d ) ) { if ( ( R - f >= r && f - d >= r ) ) { tot ++ ; } } } } System . out . println ( tot ) ; }
(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: (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: (binary_expression left: (identifier) right: (identifier)))) (while_statement condition: (parenthesized_expression (binary_expression left: (update_expression (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)))) (expression_statement (assignment_expression left: (identifier) right: (method_invocation object: (identifier) name: (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)))) (expression_statement (assignment_expression left: (identifier) right: (method_invocation object: (identifier) name: (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)))) (if_statement condition: (parenthesized_expression (binary_expression left: (binary_expression left: (decimal_integer_literal) right: (identifier)) right: (binary_expression left: (identifier) right: (identifier)))) consequence: (block (local_variable_declaration type: (floating_point_type) declarator: (variable_declarator name: (identifier) value: (method_invocation name: (identifier) arguments: (argument_list (identifier) (identifier))))) (if_statement condition: (parenthesized_expression (parenthesized_expression (binary_expression left: (binary_expression left: (identifier) right: (identifier)) right: (binary_expression left: (identifier) right: (identifier))))) consequence: (block (if_statement condition: (parenthesized_expression (parenthesized_expression (binary_expression left: (binary_expression left: (binary_expression left: (identifier) right: (identifier)) right: (identifier)) right: (binary_expression left: (binary_expression left: (identifier) right: (identifier)) right: (identifier))))) consequence: (block (expression_statement (update_expression (identifier))))))))))) (expression_statement (method_invocation object: (field_access object: (identifier) field: (identifier)) name: (identifier) arguments: (argument_list (identifier))))))