import java.util.*;
import java.lang.*;
import java.io.*;
 
abstract class Tier{
	abstract double map(double x);
}
 
class RateTier extends Tier{
	double map(double x){
		return 3.0 * x;
	}
}
 
class DivTier extends Tier{
	double map(double x){
		return x / 2.0;
	}
}
 
class Ideone{
	public static void main (String[] args) throws java.lang.Exception{
		{
			RateTier rt = new RateTier();
			Tier t = rt;
			double result = t.map(5.0);
			System.out.println("RateTier: t.map()="+result);
		}
 
		{
			DivTier dt = new DivTier();
			Tier t = dt;
			double result = t.map(5.0);
			System.out.println("DivTier: t.map()="+result);
		}
	}
}

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