import java.util.ArrayList;
import java.util.Collections;
import java.util.List;

public class Truck {

    private final int initialCapacity;
    private final List<Integer> items;
    private int remainingCapacity;

    Truck(int capacity) {
        initialCapacity = capacity;
        remainingCapacity = capacity;
        items = new ArrayList<>();
    }

    public boolean add(int item) {
        if (canAdd(item)) {
            remainingCapacity -= item;
            items.add(item);
            return true;
        }
        return false;
    }

    public int remainingCapacity() {
        return remainingCapacity;
    }

    public int initialCapacity() {
        return initialCapacity;
    }

    public boolean canAdd(int item) {
        return item <= remainingCapacity;
    }

    public List<Integer> items() {
        return Collections.unmodifiableList(items);
    }

    @Override
    public String toString() {
        return items.toString();
    }
}