// CSE 142 Lecture 14
// Files
// Scans a file of gas price data and prints the average price
// of gas in Belgium and the United States.

import java.io.*; // For File, FileNotFoundException
import java.util.*; // For Scanner

public class GasPrices {
	public static void main(String[] args) throws FileNotFoundException {
		Scanner input = new Scanner(new File("gasprices.txt"));
		
		double belgiumAvg = 0;
		double usaAvg = 0;
		int count = 0;
		
		while (input.hasNext()) {
			belgiumAvg += input.nextDouble();
			usaAvg += input.nextDouble();
			count++;
			input.next();
		}
		
		System.out.printf("Belgium average: $%.2f/gal\n", belgiumAvg / count);
		System.out.printf("USA average: $%.2f/gal\n", usaAvg / count);
	}
}