A mean multi in many steps 
but with a nice reward! This Multi Cache will bring you close to Stockholm's highest point (57 meters above the sea level) where you will have a magnificent view over the city of Stockholm. But first you have to take the stairs!
At the starting coordinates, start walking up the stairs and count:
a. The number of steps to Leg 1 (see reference point)
b. The number of remaining steps from Leg 1 to the top of the stairs
c. The number of remaining flights1 from Leg 1 to the top of the stairs
d. The number of steps in the last flight of stairs
Once you're at the top of the stairs, take a moment to walk up the street a short distance and you will have a great view of Stockholm. Here you can sit down, catch your breath, do the math below and then go and log the cache. Please include a photo from the top in your log.
1 Definition: A stair flight is a run of stairs or steps between landings [Wikipedia]
The cache is located at:
N 59 18.NNN
E 18 06.EEE
NNN = 5 * a + b + d
EEE = 4 * a - b + c
Check your solution here:
The accuracy in the geochecker is set to a generous +/- 30 meters, so even if you miss a couple of steps you should still be able to get a green light in the checker and a hint to the cache.
For more vantage points in Stockholm, go visit these caches:
Highest in Town (Stockholm), the highest natural point in central Stockholm (53 m.a.s.l.)
Vårberg, the highest natural point in Stockholm municipality (77 m.a.s.l.)
Hammarbybacken, an artificial (man made) hill in Stockholm (93 m.a.s.l.)
Tre Toppar that brings you to Högdalstoppen, the highest artificial point in Stockholm (102 m.a.s.l.)
