// Problem #99 - Truck loading


#include <iostream.h>
#include "bay.h"

int main()
{
	int Package;
	int Trucks = 0;
	
	LoadingDock Bay;
	
	cin >> Package;
	
	while (Package != -1)
	{
		if (! Bay.load(Package) )	// Load it if we can; if not, take action
		{
			if ( (Bay.totalCapacity(1) - Bay.spaceOccupied(1)) 
			   > (Bay.totalCapacity(2) - Bay.spaceOccupied(2)) )
			{
				Bay.dismiss(2);
			}
			else
			{
				Bay.dismiss(1);
			}
			Trucks++;
			Bay.load(Package);		// It must fit now!!!
		}
		cin >> Package;
	}
	
	if (Bay.spaceOccupied(1) > 0)
	{
		Trucks++;
	}
	if (Bay.spaceOccupied(2) > 0)
	{
		Trucks++;
	}
	
	cout << Trucks << " trucks used." << endl;
	
	return 0;
}