public static void main ( String [ ] args ) throws Exception {
  BufferedReader in = new BufferedReader ( new InputStreamReader ( System . in ) ) ;
  StringTokenizer st = new StringTokenizer ( in . readLine ( ) ) ;
  long l = Integer . parseInt ( st . nextToken ( ) ) ;
  long r = Integer . parseInt ( st . nextToken ( ) ) ;
  long gcd = Integer . parseInt ( st . nextToken ( ) ) ;
  long lcm = Integer . parseInt ( st . nextToken ( ) ) ;
  long n = gcd * lcm ;
  long res = 0 ;
  long sqrt = ( long ) ( Math . sqrt ( n ) ) ;
  for ( long i = gcd ;
  i <= sqrt ;
  i += gcd ) {
    long j = n / i ;
    if ( i >= l && i <= r && j >= l && j <= r ) {
      if ( gcd ( i , j ) == gcd && lcm ( i , j ) == lcm ) {
        if ( i == j ) {
          res ++ ;
        }
        else {
          res += 2 ;
        }
      }
    }
  }
  System . out . println ( res ) ;
}

public static void main ( String [ ] args ) throws Exception { BufferedReader in = new BufferedReader ( new InputStreamReader ( System . in ) ) ; StringTokenizer st = new StringTokenizer ( in . readLine ( ) ) ; long l = Integer . parseInt ( st . nextToken ( ) ) ; long r = Integer . parseInt ( st . nextToken ( ) ) ; long gcd = Integer . parseInt ( st . nextToken ( ) ) ; long lcm = Integer . parseInt ( st . nextToken ( ) ) ; long n = gcd * lcm ; long res = 0 ; long sqrt = ( long ) ( Math . sqrt ( n ) ) ; for ( long i = gcd ; i <= sqrt ; i += gcd ) { long j = n / i ; if ( i >= l && i <= r && j >= l && j <= r ) { if ( gcd ( i , j ) == gcd && lcm ( i , j ) == lcm ) { if ( i == j ) { res ++ ; } else { res += 2 ; } } } } System . out . println ( res ) ; }
(method_declaration (modifiers) type: (void_type) name: (identifier) parameters: (formal_parameters (formal_parameter type: (array_type element: (type_identifier) dimensions: (dimensions)) name: (identifier))) (throws (type_identifier)) body: (block (local_variable_declaration type: (type_identifier) declarator: (variable_declarator name: (identifier) value: (object_creation_expression type: (type_identifier) arguments: (argument_list (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: (object_creation_expression type: (type_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)))))) (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)))))) (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: (binary_expression left: (identifier) right: (identifier)))) (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: (cast_expression type: (integral_type) value: (parenthesized_expression (method_invocation object: (identifier) name: (identifier) arguments: (argument_list (identifier))))))) (for_statement init: (local_variable_declaration type: (integral_type) declarator: (variable_declarator name: (identifier) value: (identifier))) condition: (binary_expression left: (identifier) right: (identifier)) update: (assignment_expression left: (identifier) right: (identifier)) body: (block (local_variable_declaration type: (integral_type) declarator: (variable_declarator name: (identifier) value: (binary_expression left: (identifier) right: (identifier)))) (if_statement condition: (parenthesized_expression (binary_expression left: (binary_expression left: (binary_expression left: (binary_expression left: (identifier) right: (identifier)) right: (binary_expression left: (identifier) right: (identifier))) right: (binary_expression left: (identifier) right: (identifier))) right: (binary_expression left: (identifier) right: (identifier)))) consequence: (block (if_statement condition: (parenthesized_expression (binary_expression left: (binary_expression left: (method_invocation name: (identifier) arguments: (argument_list (identifier) (identifier))) right: (identifier)) right: (binary_expression left: (method_invocation name: (identifier) arguments: (argument_list (identifier) (identifier))) right: (identifier)))) consequence: (block (if_statement condition: (parenthesized_expression (binary_expression left: (identifier) right: (identifier))) consequence: (block (expression_statement (update_expression (identifier)))) alternative: (block (expression_statement (assignment_expression left: (identifier) right: (decimal_integer_literal))))))))))) (expression_statement (method_invocation object: (field_access object: (identifier) field: (identifier)) name: (identifier) arguments: (argument_list (identifier))))))