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Se dau doua cercuri. Acestea se pot intersecta in 0, 1, 2 sau o infinitate de puncte (daca sunt identice).
h2. Cerinta

h2. Restrictii si precizari

* 0 ≤ $x{~1~}, y{~1~}, R{~1~}, x{~2~}, y{~2~}, R{~2~}$ ≤ 1.000

* $0 ≤ x{~1~}, y{~1~}, R{~1~}, x{~2~}, y{~2~}, R{~2~} ≤ 1.000$

* Rezultatul va fi afisat cu o precizie de $3$ zecimale
h2. Exemplu

cercuri.in cercuri.out
5 7.714
 
5 5 5 6 6 6 7.714
 
5 5 5 6 6 6 18.708
 
0 0 10 5 5 10 -1
 
0 0 10 0 0 10 -2
 

table(example). |_. cercuri.in |_. cercuri.out |
| 5
5 5 5 6 6 6
5 5 5 6 6 6
0 0 10 5 5 10
0 0 10 0 0 10

0 0 1 1000 1000 1

| 7.714
7.714
18.708
-1
-2 |

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