import java.util.*;
import java.lang.*;
import java.io.*;
class Ideone
{
{
Scanner scan
= new Scanner
(System.
in); int x1 = scan.nextInt(), y1 = scan.nextInt();
int x2 = scan.nextInt(), y2 = scan.nextInt(), z2 = scan.nextInt();
double D
= 1/Math.
sqrt((x2
- x1
) * (x2
- x1
) + (y2
- y1
) * (y2
- y1
) + z2
* z2
); }
}
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