module Main where
import Control.Monad
import Control.Applicative
import Data.Maybe
import Data.List
import qualified Text.Printf
import qualified Data.ByteString.Char8 as BC
import qualified Data.ByteString as BC

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main :: IO ()
main = do
    n <- readInt
    [a, b, c] <- readInts
    print $ solve a b c n

solve :: Int -> Int -> Int -> Int -> Int
solve a b c n = sum (map (div n) [a,b,c])
                - sum (map (div n) [a `lcm` b, b `lcm` c, c `lcm` a])
                + div n (a `lcm` b `lcm` c)

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{- Int input -}

parseInt :: BC.ByteString -> Int
parseInt = fst . fromJust . BC.readInt

parseInts :: BC.ByteString -> [Int]
parseInts = map parseInt <$> BC.words

readInt :: IO Int
readInt = parseInt <$> BC.getLine

readInts :: IO [Int]
readInts = parseInts <$> BC.getLine

{- Double Formatting -}

doubleFormat :: Double -> String
doubleFormat = Text.Printf.printf "%.12f"