exec tclsh $(1+"$@")

As a part of learning shell scripting I was just going through some already created scripts there I found-

 
exec tclsh "$0" $(1+"$@")

Here I was able to find what exec ,tclsh does & o/p of same but I could not find usage & output of $(1+"$@").

Can anybody pls expalain me usage details of it?

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