/* package whatever; // don't place package name! */
import java.util.*;
import java.lang.*;
import java.io.*;
/* Name of the class has to be "Main" only if the class is public. */
class Ideone
{
{
Scanner s
= new Scanner
(System.
in); while(s.hasNextLine()) {
double r = s.nextInt();
double d = s.nextInt();
double r2 = (r*r)-((d*d)/4);
}
}
}
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