You just got your year-end bonus. As you had a lot of money, you decided to take your family to the United States for a twenty-day self-driving travel. One day, when you were driving on the Great Plains, you found you had left highway by accident. After checking your GPS, you realized that you were now D (0 < D <= 1000) miles from the highway. The highway is straight and extends infinitely. When you are driving outside the highway, your maximum speed is v0 mph, but on the highway you can move in a maximum speed of v1 mph (200 >= v1 > 1.2 v0 > 0). It took no time to get on or off the highway. Suddenly, it came to your mind that there was a region inside which any point can be reached within T (0 < T <= 1000) hours. You wanted to know area of this region.