Heads or Tails: Flip a coin and read the appropriate spoiler-
Heads
Spoiler:
Add together the digits in your date of birth, multiply that number by 3 and add that many edges to your total. (e.g. If your birthday is 22nd May 1987 it's 2+2+5+1+9+8+7 = 34 * 3 = 102)
Tails
Spoiler:
Count up the number of letters in your full name, multiply the number by 2 and remove that many edges from your total (e.g. Mary Jane Smith = 13 * 2 = 26)
Any player deliberately looking at both spoilers can add their max instead