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'.

Context: he held already during his mission in 1430 to Pope Martin V Link Information: Pope Martin V (; January/February 1369 – 20 February 1431) Question: How long after Markos' mission to the Pope did Martin V pass away?
Answer: 1

Context: Kork fought in World War I on the Northwestern Front and the Western Front. Link Information: The armies subordinated to the Western Front took part in the Russian invasion of East Prussia at the beginning of the war. Question: In which countries were the fronts located that Kork fought on during World War I?
Answer: Russian 

Context: The advance continued across the Seine, 19 August. Link Information: After the successful allied invasion of Normandy in June 1944, The United States Third Army was formed in France to assist in the breakout from Normandy, code named Operation Cobra. The drive to the Seine began on 3 August, Question: How long did the advance across the Seine last?

Answer: 17