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So the "0x" prefix means that the number following is expressed in hexadecimal (also known as base16) in which the 16 digits are represented by the ten decimal digit symbols (i.e., '0' through '9') followed by the first six letters of the alphabet (i.e., 'A' through 'F'  upper/lower case doesn't matter).
So just like the decimal representation 314 means
314 = (3 x 10^2) + (1 x 10^1) + (4 x 10^0)
the hexadecimal representation 0x5FFF means
0x5FFF = (5 x 16^3) + (15 x 16^2) + (15 x 16^1) + (15 x 16^0) = 24,575
