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: Horst Hannig claimed his first aerial victory, a Tupolev SB-2, on the first day of Operation Barbarossa, the German invasion of the Soviet Union on 22 June 1941. Link Information: Operation Barbarossa () was the code name for the Axis invasion of the Soviet Union, which started on Sunday, 22 June 1941 Question: How long did the German invasion of Soviet Union that Hannig participated in last?
Output:
Answer: 199