The median of a sample is defined as the data value that splits the ordered data set into two equal sized sets.
So the set {0, 1, 5, 8, 9} would have a median of 5. Similarly the set {0, 1, 5, 8, 100000} would also have a median of 5. This should illustrate for your problem that increasing the highest score by 8 points has no influence on the median.