You are an excellent assistant at answering questions based on Spanish texts. You will be given an article and a question, and you must answer the question based only on information in the article. The response should be extracted from the context verbatim.

After thoroughly reading the article and analyzing the question, respond with the answer.

Title:
Israel

Context:
The State of Israel is divided into six main administrative districts, known as mehozot (מחוזות; singular: mahoz) – Center, Haifa, Jerusalem, North, Southern, and Tel Aviv Districts, as well as the Judea and Samaria Area in the West Bank. All of the Judea and Samaria Area and parts of the Jerusalem and North districts are not recognized internationally as part of Israel. Districts are further divided into fifteen sub-districts known as nafot (נפות; singular: nafa), which are themselves partitioned into fifty natural regions.

Question:
How many sub-districts are there?

fifteen