#146. Triangle area
You get the base a and the height h of a triangle. Print its area (`a * h / 2`) with 1 decimal place.
### Input
Each on its own line: a, h (1 ≤ value ≤ 30).
### Output
A decimal number.
Examples
Input
8 22
Output
88.0
Input
30 24
Output
360.0
💡 You can solve it with Python, JavaScript or blocks. Read the input line by line with input(). Don't print a question (like input("Number: ")). Print exactly what the output asks for, nothing more.