{-# LANGUAGE ScopedTypeVariables #-}
{-# LANGUAGE BangPatterns #-}

import Control.Applicative
import Control.Monad
import Control.Arrow
import Data.List
import Data.Maybe
import Data.Char
import qualified Data.ByteString.Char8 as B
import Text.Printf

readInt = ( readLn :: IO Int )
readInts = map ( read :: String -> Int ) . words <$> getLine

getList = map ( fst . fromJust . B.readInt ) . B.words <$> B.getLine

which a b f = if f then a else b
mp [ a, b ] = ( a, b )

main = do
	[ a, b, c ] :: [Integer] <- map read . words <$> getLine
	print $ minimum $ [ f a b c, f b a c, f c a b ]

f a b c = abs $ x * bc - y * bc
	where
		x = a `div` 2
		y = a - x
		bc = b * c
