### STEP 1

Startup screen.

Startup screen.

There are some calculating formulas around the door. You can find the logic if you notice that how many letters the each number has. e.g., 2 (two: 3 letters) * 7 (seven: 5 letters) + 8 (eight: 5 letters) = 20 letters. So you need to enter 39 to the door as the answer of 2+5+9*7+0*10.

Escaped.