Given the task definition and input, reply with output. This task involves creating questions from a given passage that involve some kind of complex reasoning (including numerical reasoning).
The generated questions must require looking at more than one part of the passage to answer. Try to use a variety of reasoning types in your questions (some of the sample reasoning types are illustrated in the 'positive examples' field) and also have a variety of answer types (spans, numbers, dates). A span is a continuous phrase taken directly from the passage or question. In such questions, the answer spans are recommended to be five words. Questions with answer type "number", are expected to start with "How many". For instance, "How long did an event last?" can be phrased as "How many years did an event last?". To increase diversity, try to create more questions for which the answer will be multiple spans. Please create questions that require AT LEAST 2 arithmetic operations as illustrated in the 'positive examples' field. You are encouraged to try DIFFERENT COMBINATIONS of operations and not just limit to the combinations shown in those examples. The more challenging questions you create, the better it is.

Passage: The Russian Naval Aviation is the air arm of the Russian Navy, having superseded Soviet Naval Aviation. The Russian Navy is divided into four fleets and one flotilla: Northern Fleet, Pacific Ocean Fleet, Baltic Fleet, Black Sea Fleet, and Caspian Flotilla. The air forces of the most important fleets, the Northern and Pacific fleets, operate long range Tu-142 anti-submarine warfare aircraft and Il-38 medium-range ASW aircraft. Formations operating supersonic Tu-22M3 bombers were transferred to the Russian Air Force's Long Range Aviation in 2011. The relatively small fleets, the Baltic and Black Sea, currently have only tactical Su-24 bombers and ASW helicopters in service. The small Caspian Flotilla operates An-26 and Mi-8 transports, Ka-27PS rescue helicopters, as well as some Ka-29 and Mi-24 armed helicopters. In 2011, the Russian Navy Deputy Commander-in-Chief for Naval Aviation and Air Defense/Commander, Naval Air and Air Defense Forces is Major General Igor Kozhin.
How many different air transports did the Caspian Flotilla operate?