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diff --git a/template/src/exe/Main.hs b/template/src/exe/Main.hs
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+++ b/template/src/exe/Main.hs
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+{-# LANGUAGE ScopedTypeVariables #-}
+
+module Main where
+
+import           System.Environment             ( getArgs )
+import           Template                       ( fib )
+
+main :: IO ()
+main = do
+  -- https://lotz84.github.io/haskellbyexample/ex/command-line-arguments
+  args <- getArgs
+  let arg = head args
+
+  -- https://stackoverflow.com/a/20667721
+  print (fib (read arg :: Int))