UVa 10579 - Fibonacci Numbers

10579 - Fibonacci Numbers

 * http://acm.uva.es/p/v105/10579.html

Summary
A Fibonacci Sequence problem with the use of BigNum.

Explanation
As long as you remember that f(1)=1 and f(2)=1, there are no special techniques required aside from using a BigNum library.

Input
3 100

Output
2 354224848179261915075