CF5D Follow Traffic Rules

Everybody knows that the capital of Berland is connected to Bercouver (the Olympic capital) by a direct road. To improve the road's traffic capacity, there was placed just one traffic sign, limiting the maximum speed. Traffic signs in Berland are a bit peculiar, because they limit the speed only at that point on the road where they are placed. Right after passing the sign it is allowed to drive at any speed. It is known that the car of an average Berland citizen has the acceleration (deceleration) speed of $ a $ km/h $ ^{2} $ , and has maximum speed of $ v $ km/h. The road has the length of $ l $ km, and the speed sign, limiting the speed to $ w $ km/h, is placed $ d $ km ( $ 1

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