Why would the sum of the 2 highest dice rolls be 3? If all 3 dice are showing 1 the sum of the 2 "highest" die is 2 and not 3!

Also I want to be able to try this with a variable number of total rolls (not a hardcoded 100). Please edit the code so that:
* The sum of 2 is included in the histogram
* I can call this script from my command line with an argument that defines the total number of rolls.
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