Amin can decrease the number $x$ by $k$ units in one operation. If the result turns out to be negative, he will write down the absolute value of the result in $x$. In other words, the operation takes the form: $x = |x - k|$. Hussein named the number $x$ to Amin as the initial one. Determine the smallest value that can be obtained from it by repeating the above operation any number of times. This is a very difficult task for Amin. Calculate the answer for him. \InputFile Two integers $x~(0 \le x \le 10^{18})$ and $k~(1 \le k \le 10^{18})$. \OutputFile Output the smallest value that can be obtained from $x$. \Examples In the first test, $x = 11$. After performing one operation, we get $x = |11 - 4| = 7$. After two operations, $x = |7 - 4| = 3$. After three operations, $x = |3 - 4| = 1$, which is the smallest value that $x$ can take. In the second test, $x = 2$. It is also the smallest value that $x$ can take.