This cache brings you to the site of a former prison, closed in 2014. The site is now redeveloped for housing.

According to Wikipedia:

HM Prison Aberdeen (formerly known as Craiginches) was a medium-security prison, located in the city of Aberdeen, Scotland. The prison was managed by the Scottish Prison Service. Known as one of the most overcrowded prisons in Scotland, it had a design capacity of 155 and was contracted to hold up to 230 prisoners. However, on the first day of an inspection in January 2009 it held 264 prisoners. In 2014, it was closed in favour of the new HMP Grampian and the site was redeveloped as a housing estate.

Henry John Burnett, the last man to be executed in Scotland, was hanged inside the prison on 15 August 1963.

Your task:

The given coordinates will lead you to an info plaque about the prison, which you will find in the wall. There are two dates on it. Sum up all the digits - that's your X.

Final coordinates:

N 57 08.[X-22] W 002 05.[X*26+15]