Can I set a monthly budget for adwords and not a daily budget?...In other words, I set a monthly budget but not divide it among the days of the month; for example, if I had $100 to spend on adwords for a month, one day it may cost me $10 and the other day it cost me $50 but if I reached the $100, advertising would stop this is instead of having $100 divided equally among the days of the month... because I may receive more clicks in a day than the other.