Problem22928--Overlapping cells

### 22928: Overlapping cells

[Creator : ]
Time Limit : 1.000 sec  Memory Limit : 128 MB

#### Description

Description:

Today, Subaba is doing experiments, he is observing overlap of  two cells. Now, your task is to find out these the situation of two cells touching the nutrient solution.

To simplify the question, we take cell as a circle.

#### Input

Input one row ,in which has 6 floating-point numbers, x1, y1, r1, x2, y2, r2 ( -1000000<=x1, y1, r1, x2, y2, r2<=1000000 )indicate the coordinate of circle center and radius of cell separately.

#### Output

The answer accurate to 2 decimal.

#### Sample Input Copy

-1 0 2 1 0 2
-2 0 2 2 0 2
1 1 1 1 1 1



#### Sample Output Copy

16.76
25.13
6.28


#### HINT

Π = 3.1415926535898