371 - Triangle Stone

Triangle Stone

Time Limit: 1 sec

**The Problem**

You are given a **Triangle Stone**. Your task is to find the **area** of the stone.

**The Input**

The input file contains several lines. Each line contains three integers the length of the sides of the stone. All are ranged to **0 to 1000**. The input file is terminated by EOF.

**The Output**

For each line of input output will print the **area** of the stone rounded to 2 decimal points in a separate line. Remember if the T**riangle** is invalid print **0.00**

**Sample Input**

3 4 5

1 2 3

**Sample Output**

6.00

0.00

Problem Setter: Samia Safa Ahmed