On the top of the terminal where it currently says 'Command' and then 'pset3/fifteen/fifteen.c' -- that's where you need to add your command line argument. It should work once you hit 'run' again. Another issue I run into with the GDB is already having an instance of it running causing it to hang. Make sure you kill any instances of it by running 'ps aux' and noting the PID of any GDB instances and then running 'kill -9 [PID]' -- hope this helps!
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