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:
Edmund_Burke

Context:
Burke believed the Government was not taking the uprising seriously enough, a view reinforced by a letter he had received from the Prince Charles of France (S.A.R. le comte d'Artois), dated 23 October, requesting that he intercede on behalf of the royalists to the Government. Burke was forced to reply on 6 November: "I am not in His Majesty's Service; or at all consulted in his Affairs". Burke published his Remarks on the Policy of the Allies with Respect to France, begun in October, where he said: "I am sure every thing has shewn us that in this war with France, one Frenchman is worth twenty foreigners. La Vendée is a proof of this".

Question:
How many foreign supporters did Burke think a French royalist was worth?

twenty