What is the three digit code at the very end of Part 2?

Once you arrive at the house you will find a map on the map will show a red line with circled X's mapping locations of riverstone high and Zoe's house the red line and the X's is numeral numbers that you have to convert into regular numbers that then will give you the code 205

It's 205. The two X on the map stand for 20 and the V is 5.

205