A Miner Task

import java.util.LinkedHashMap;
import java.util.Map;
import java.util.Scanner;

public class AMinerTask {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);

        Map<String, Integer> quantity = new LinkedHashMap<>();

        String resource = scanner.nextLine();
        while (!resource.equals("stop")) {
            int value = Integer.parseInt(scanner.nextLine());

            if (!quantity.containsKey(resource)) {
                quantity.put(resource, value);
            } else {
                int currentQuantity = quantity.get(resource);
                quantity.put(resource, currentQuantity + value);
            }
            resource = scanner.nextLine();
        }
        quantity.forEach((key, value) -> System.out.println
                (key + " -> " + value));
    }
}