Chicken ordering machine

class SoldOutError(Exception):
    pass

chicken = 10
waiting = 1

while(True):
    try:
        print ("Remaining Chicken: {0}").format(chicken))
        order = int(input("How many chickens would you like to order?"))
        if order > chicken:
            print ("Insufficient material")
        elif order <= 0:
            raise ValueError    
        else:
            print("[Standby Number {0}]): {0} Chicken ordered."\
            .format(waiting, order))
            waiting += 1
            chicken -= order

         if chicken == 0:
            raise SoldOutError   

except ValueError:
    print("Invalid value entered.")   
except SoldOutError:
    print("We are out of stock and no longer accept orders.")   
    break