main = do
  li <- getLine
  let [a,v] = map read $ words li
  li <- getLine
  let [b,w] = map read $ words li
  li <- getLine
  let [t] = map read $ words li
  let ans = compute a v b w t
  putStrLn $ if ans then "YES" else "NO"

compute :: Int -> Int -> Int -> Int -> Int -> Bool
compute a v b w t = v > w && abs (a-b) <= t * (v-w)

{-
何だかなぁ。
-}
