In December 2001 a Search Using the Web Search Engine

Short Answer

In December 2001 a search using the Web search engine Google ^TM for "Costenoble" yielded 11,000 Web sites containing that word. A search for "Waner" yielded 67,000 sites. A search for sites containing both words yielded 4,161 sites. How many Web sites contained either "Costenoble" or "Waner" or both ?
The number of Web sites is __________.