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Forth

// Modules
open System
// Recursive definition of Fibonacci numbers
let rec fib n =
match n with
| 0 -> 0
| 1 -> 1
| _ -> fib (n-1) + fib (n-2)
// Read from stdin and print result
printfn "Inserisci l'indice del numero di fibonacci che vuoi calcolare:\n"
let i = Console.ReadLine() |> int
printfn "%A" (fib (i))