Area Of Triangle

easy
1) You will be given two values d1 and d2 representing the height and base of triangle.
2)You are supposed to find the area of triangle.

Input Format

A double value d1 representing height A double value d2 representing base

Output Format

A double value d

Constraints

n/a

Notice

n/a

Example

Input
7.02
3.54
Output
12.4254
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