fibonacci( 0) = 1
fibonacci( 1) = 1
fibonacci( 2) = 2
fibonacci( 3) = 3
fibonacci( 4) = 5
fibonacci( 5) = 8
fibonacci( 6) = 13
fibonacci( 7) = 21
fibonacci( 8) = 34
fibonacci( 9) = 55
fibonacci(10) = 89
exit(0)