import System.Environment

teststring a _ 0 = a
teststring a b n = a ++ "*(" ++ teststring a b (n-1) ++ "+" ++ b ++ ")+" ++ teststring a b (n-1)

main = do args <- getArgs
          let n = read $ args !! 0
              a = args !! 1
              b = args !! 2
          putStr $ teststring a b n