Editorial for Weirdland
Remember to use this editorial only when stuck, and not to copy-paste code from it. Please be respectful to the problem author and editorialist.
Submitting an official solution before solving the problem yourself is a bannable offence.
Submitting an official solution before solving the problem yourself is a bannable offence.
def solve(x,y):
bottom = (x // y) * y
top = (x // y + 1) * y
return min(x-bottom,top-x)
x,y=(int(i) for i in input().split())
print(solve(x,y))