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The total development time had been around half a year , with a cost of around US $ 25,000 to cover the team 's rent and US $ 750 per month salaries , plus around US $ 6,500 for the computer John Carmack used to develop the engine and the US $ 5,000 to get the " Wolfenstein " copyright .
 person: John Carmack
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: location, person, organization 
Text: {0} 
 Entities: John Carmack 
Answer:
 person: John Carmack