Extract the answer to the following question from the movie plot. If the question isn't answerable, please output "Can't answer". Question: For how many years is Janusz sentenced to work in the labor camp? Title: The Way Back Movie plot: During World War II, after the Soviet invasion of Poland, young Polish military officer Janusz Wieszczek (Jim Sturgess) is held as a POW and interrogated by the NKVD. The Soviets, unable to get him to say he is a spy, take into custody his wife from whom they extort a statement condemning him. He is sentenced to 20 years in a Gulag labour camp deep in Siberia. There Janusz meets those with whom he later plans an escape: Mr. Smith (Ed Harris), an American engineer; Khabarov (Mark Strong), an actor; Valka (Colin Farrell), a hardened Russian criminal; Tomasz (Alexandru Potocean), a Polish artist; Voss (Gustaf Skarsgard), a Latvian priest; Kazik (Sebastian Urzendowsky), a Pole suffering from night blindness; and Zoran (Dragos Bucur), a Yugoslavian accountant. Khabarov secretly tells Janusz that he is planning to escape south to Mongolia, passing Lake Baikal. Mr. Smith cautions Janusz that it is Khabarov's way to discuss escape plans with newcomers, to maintain his morale, but nothing will come of it. At times Janusz seems to hallucinate the front door of a country home and adjoining window ledge, which holds plants and a rock he attempts to reach for. Janusz follows through with the escape with Mr. Smith, Valka, Voss, Tomasz, Zoran, and Kazik during a severe snowstorm that covers their tracks. Kazik freezes to death the second night of the trek, after losing his way back to the campsite while looking for wood, and the group buries him. After many days of travelling across the snows of Siberia, the group reaches Lake Baikal. There they meet Irena (Saoirse Ronan), a young Polish girl, who tells them that Russian soldiers murdered her parents, sent her to a collective farm near Warsaw, where they treated her cruelly, so she escaped. Mr. Smith realises the inaccuracies in her story, as Warsaw is occupied by the Germans; nevertheless, despite his misgivings that she'll slow them down and tax their meager food supply, he agrees with the group to let her in. Mr. Smith eventually cautions her about the lie and says he...
A:
20 years