diff --git a/zmj/readme.md b/zmj/readme.md
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+++ b/zmj/readme.md
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+# How do I run this?
+
+It's a script. `./roman.fsx ../input.txt` should work with the .NET SDK installed. Make sure the file is executable: `chmod +x roman.fsx`.
+
+If that's not working, invoke the F# REPL directly: `dotnet fsi roman.fsx ../input.txt`.
\ No newline at end of file
diff --git a/zmj/roman.fsx b/zmj/roman.fsx
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+#!/usr/bin/env -S dotnet fsi
+let rec c(n,s)=if n=0 then s else s+c(List.pick(fun(v,d)->if n-v>=0 then Some(n-v,d) else None)(List.zip [1000;900;500;400;100;90;50;40;10;9;5;4;1] ["M";"CM";"D";"CD";"C";"XC";"L";"XL";"X";"IX";"V";"IV";"I"]))
+for l in System.IO.File.ReadLines fsi.CommandLineArgs[1] do printfn"%s"(c(int l,""))