# filling containers

def f():
    var volToFill, fast, medium, slow, vol, volMeasured, r
	fast = 10
	medium = 3
	slow = 1
	volMeasured = 0
        r = unif(0,1)
	volMeasured = volMeasured + r

	while volMeasured <= volToFill:
		if volToFill < (volMeasured + fast):
                        r = unif(9,10)
			volMeasured = volMeasured + r
		else:
			if volToFill < (volMeasured + medium):
                                r = unif(2,4)
				volMeasured = volMeasured + r
			else:
                                r = unif(0,2)
				volMeasured = volMeasured + r

                r = unif(0,1)
		volMeasured = volMeasured + r
		tick 1