Score Calculation in LoGu Primary School Math Exam

LoGu Primary School's math exam consists of several multiple choice questions categorized into three difficulty levels: Simple, Medium, and Difficult. In this problem, we only consider Simple and Difficult questions with the following scoring rules:

• Simple Questions: Each correct answer earns \(5\) points, and no points are awarded for an incorrect answer.
• Difficult Questions: Each correct answer normally earns \(20\) points while an incorrect answer penalizes \(20\) points.

However, the school strives to ensure that students do not neglect the basics. Therefore:

• If the total score from simple questions \( (\text{number of correct simple answers} \times 5) \) is \( \le M \), then even if a difficult question is answered correctly, it gives \(0\) points. (Wrong answers in difficult questions still result in a penalty of \(20\) points.)

Finally, if the cumulative score of all questions is negative, the final score is set to \(0\).

You are given the following five integers:

1. \(a\): The total number of simple questions in the exam.
2. \(b\): The total number of difficult questions in the exam.
3. \(c\): The number of simple questions answered correctly by the student.
4. \(d\): The number of difficult questions answered correctly by the student.
5. \(M\): The score limit for simple questions.

Compute the student's final score according to the rules above.

inputFormat

The input consists of a single line containing five space-separated integers: \(a\), \(b\), \(c\), \(d\), and \(M\).

outputFormat

Output a single integer representing the student's final score.

sample

10 5 4 3 20

0