// For more information see https://aka.ms/fsharp-console-apps
printfn "Hello from F#"

let rec sumDigits n =
    if n < 10 then n
    else (n % 10) + sumDigits (n / 10)

[<EntryPoint>]
let main argv =
    System.Console.WriteLine("Введите число:")
    let number = System.Console.ReadLine() |> int
    
    let result = sumDigits number
    System.Console.WriteLine($"Сумма цифр числа {number} равна {result}")
    
    0