Alphabet B - Bubbling Bath Mystery Cache

This is the the 2nd cache in the series of alphabet caches. The purpose of this cache is to eventually create a series of caches from A to Z. The next cache in the series is Alphabet C - Cutting Edge (GCKYF3) by Liimes.

Go to the place where coordinates point. Look at the house and calculate the number of the letters on the grey wall (those big ones). Let this number be C. The A and B values you can retrieve from the https://coord.info/GC9WNYY

The cache is located at: N60° 12.xxx, E024° 39.yyy

xxx =­­ A+3*C-4
yyy = B

Take your swimming suit with you if you have extra time.