Instructions: In this task, you're given a statement, further information available on a particular linked term from the statement, and a question. Your job is to generate the answer to the question by using the information provided. If there is no clear answer obtainable, output 'none'.
Input: Context: The following year, in 1264, Pope Urban IV instituted the Feast of Corpus Christi to celebrate this miraculous event. Link Information: ope Urban IV

Pope Urban IV (; c. 1195 2 October 1264), born Jacques Pantaleon, was the head of the Catholic Church and ruler of the Papal States from 29 August 1261 to his death in 1264. Question: How many years did the Pope serve that had instituted the Feast of Corpus Christi?
Output:
Answer: 3