everest% cc fib1.c -o fib1
everest% 

everest% fib1 1
Fib(1) = 1
everest% fib1 2
Fib(2) = 2
everest% fib1 3
Fib(3) = 3
everest% fib1 4
Fib(4) = 5
everest% fib1 5
Fib(5) = 8
everest% fib1 9
Fib(9) = 55
everest% fib1 10
Fib(10) = 89
everest% fib1 17
Fib(17) = 2584
everest% fib1 24
Fib(24) = 75025
everest% 

everest% time fib1 35
Fib(35) = 14930352
6.8u 0.0s 0:06 98% 0+0k 0+0io 0pf+0w
everest% 

everest% time fib1 42
Fib(42) = 433494437
199.6u 0.2s 3:22 98% 0+0k 0+0io 0pf+0w
everest%