Description

There is a triangle on a plane with its three vertex coordinates being (x1, y1), (x2, y2), and (x3, y3). The task is to calculate the area of this triangle, rounded to two decimal places.

Input Format

The input consists of a single line containing 6 single-precision floating-point numbers, corresponding to x1, y1, x2, y2, x3, y3 respectively.

Output Format

The output is a single line displaying the area of the triangle, rounded to two decimal places.

0 0 4 0 0 3

6.00