toInt :: String -> Int
toInt = read :: String -> Int

main = do
  [a, v] <- map toInt . words <$> getLine
  [b, w] <- map toInt . words <$> getLine
  t <- toInt <$> getLine
  putStrLn $ if (abs (a-b)) <= ((v-w) * t) then "YES" else "NO"
