// Helene Martin, CSE 142
// Calculates average gas prices in Belgium and USA over a period of time

import java.io.*;
import java.util.*;

public class GasPrices {
	public static void main(String[] args) throws FileNotFoundException {
		Scanner s = new Scanner(new File("gasprices2.txt"));
		
		double belgium = 0;
		double usa = 0;
		int count = 0;
		
		while (s.hasNext()) {
			belgium = belgium + s.nextDouble();
			usa = usa + s.nextDouble();
			s.next();
			
			count++;
		}
		
		System.out.println("Belgium: " + belgium / count + " $/gal");
		System.out.println("USA: " + usa / count + " $/gal");

	}
}