import java.util.*;
import java.lang.*;
import java.io.*;
class Ideone
{
{
Scanner sc
= new Scanner
(System.
in);
double pencil = sc.nextDouble();
double pen = sc.nextDouble();
double eraser = sc.nextDouble();
double totalAmount = pencil + pen + eraser;
double tax = (totalAmount * 18) / 100;
}
}
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