Recent days, a joke spread out among Chinese social networks. "If *Yao Ming*, *Guo Jingming* and *He Jiong* lying on the ground, can they form a triangle?"

Some netizens think that it is impossible to form a triangle since *Yao Ming* is a basketball giant, while *Guo Jingming* and *He Jiong* are artists with short statures.

But another group of netizens came out and claim: "Yes, they can!" Someone even has presented a sketch to prove their theory:

There are three guys in somewhere of the world. They have learned of this idea and want to try it out by themselves. Given you the height of the three guys, please find out the maximum area of triangle they can form. The height consists of two parts: the upper part of body `U _{i}` and the lower part of body

There are multiple test cases (about 3000). For each test case:

There are three lines. Each line consists of two integers `U _{i}` and

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