PROGRAMMING:Triangle area

Please write a program, input the bottom $$B $$and height $$h $$of the triangle, calculate and output the area of the triangle $$a $.
![ Title. JPG] (~ / cafc7e34-5643-4e13-9290-7147a9863e04. JPG)
####Input format
>$$B $$and $$h$$
####Output format
> $$a$$
####Input sample
```in
19.77 48.36
```
####Output sample
```out
four hundred and seventy-eight point zero four
```
Requirement: output 2 decimal places (round the last place).







answer：If there is no answer, please comment