Deliv-e-droid

In the game, Deliv-e-droid, a robot droid has to deliver packages while avoiding obstacles. At the end of the game, the final score is calculated based on the following point system:

• Gain $50$ points for every package delivered.
• Lose $10$ points for every collision with an obstacle.
• Earn a bonus $500$ points if the number of packages delivered is greater than the number of collisions with obstacles.

Your job is to determine the final score at the end of a game.

The input will consist of two lines. The first line will contain a non-negative integer $P$, representing the number of packages delivered. The second line will contain a non-negative integer $C$, representing the number of collisions with obstacles.

The output will consist of a single integer $F$, representing the final score.