import java.util.*;
import java.lang.*;
import java.io.*;
class Main
{
{
Scanner scan
= new Scanner
(System.
in); double x1 = scan.nextDouble(), y1 = scan.nextDouble(), r1 = scan.nextDouble();
double x2 = scan.nextDouble(), y2 = scan.nextDouble(), r2 = scan.nextDouble();
double range
= Math.
sqrt((x2
- x1
) * (x2
- x1
) + (y2
- y1
) * (y2
- y1
)); double rads = r1 + r2;
if (range == 0 && r1 == r2) {
}
else if (range == rads || range + r1 == r2 || range + r2 == r1) {
}
else if ((range > rads) || ((range < rads) && ((range * 2 < r1 && range + r2 < r1) || (range * 2 < r2 && range + r1 < r2)))){
}
else {
}
}
}
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