Fibonacci Returns

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Santa and Banta are buddies. Santa has a good sense of humour, but Banta is unable to or partially understands some jokes. Now Santa has with him N jokes he wishes to tell to Banta. Due to lack of time, he cannot tell all of them and has to choose R jokes for Banta. The total value of all the jokes he tells Banta is Fibonacci ( N C R ). Note that, Fibonacci(1)=Fibonacci(2)=1 and Fibonacci(n)=Fi

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