Please answer the following question about this movie plot. If it's un-answerable, please output "No answer". Question: How many Nazi officers travel to Earth to prepare for invasion? Movie plot title: Iron Sky Movie plot: The film opens in 2018 with an American manned landing mission to the Moon. The lander carries two astronauts, one of them an African American male model, James Washington, specifically chosen to aid the U.S. President in her re-election (various "Black to the Moon" word-play posters are seen in the film, extolling the new Moon landing). Upon landing on the far side of the Moon, they encounter Nazis hidden there since 1945 (self-styled the "Fourth Reich" in dialogue). Washington is taken captive after the other astronaut is killed. Nazi scientist Doktor Richter examines Washington and obtains his smartphone, which he later recognizes as having more computing power than the 1940s style computers of the Fourth Reich, enabling its use as a control unit to complete their giant space battleship Gotterdammerung. When the Doktor strives to demonstrate his Wunderwaffe to the current Fuhrer, Wolfgang Kortzfleisch, the phone's battery is quickly exhausted. Nazi commander Klaus Adler, chosen for genetic reasons to mate with Earth specialist Renate Richter (Doktor Richter's daughter), embarks in a flying saucer to collect more such computers on Earth. He takes with him Washington, who has been "Aryanized" by Doktor Richter using an "albinizing" drug. Upon landing in New York, they discover that Renate has stowed away with them. They abandon Washington after he connects them with the President's campaign adviser, Vivian Wagner. Whereafter Adler and Renate energize the President's re-election campaign using Nazi-style propaganda. At the time, Renate is unaware of Adler's ambition to replace Kortzfleisch and rule the world. After three months, Kortzfleisch lands on Earth and confronts Adler, but is killed by Adler and Vivian. Adler declares himself the new Fuhrer before returning to orbit in Kortzfleisch's flying saucer, deserting Vivian and taking her tablet computer. Concurrently, Renate is persuaded by the now-homeless Washington that Adler intends global genocide. Shortly afterwards, the Moon Nazis launch a mass...
The answer to this question is:
2