module Main where

import Control.Applicative
import Control.Monad
import Data.List

main :: IO ()
main = do
    [x, y, z] <- fmap read . words <$> getLine :: IO [Int]
    let f n = y * n + z * (n + 1)
    let ans = takeWhile (<= x) $ fmap f [1 ..]
    print $ length ans