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

solve x y t
  | y < 0 = False
  | otherwise = ceiling (x / y) <= t