'CM' = 100 from 1,000 = 900 'XC' = 10 from 100 = 90 'IX' = 1 from 10 = 9 'CMXCIX' = 999
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bar(bar(CMXCIX)CMXCIX)CMXCIX
CMXCIX.999 = CMXCIX
999
In todays notation of Roman numerals they represent: 999
4000 = (IV), 900 = CM, 90 = XC and 9 = IX, so 4999 would be (IV)CMXCIX.