main = do
  [a,v] <- map (read :: String -> Int) . words <$> getLine
  [b,w] <- map (read :: String -> Int) . words <$> getLine
  t <- readLn
  if a == b 
  then putStrLn "YES"
  else if a > b && (a+v*t < b+w*t || a+v*t == b+w*t)
       then putStrLn "YES"
       else if a < b && ((a+v*t > b+w*t) || (a+v*t == b+w*t))
            then putStrLn "YES"
            else putStrLn "NO"
