February 29 is a date that usually occurs every four years, and is called leap day. This day is added to the calendar in leap years as a corrective measure, because the Earth does not orbit around the sun in precisely 365 days. The Gregorian calendar is a modification of the Julian calendar first used by the Romans.
So using standard 12 oz. pop/beer cans that are rinsed and dry I find that the consensus is that it takes from 32-35 cans to make a pound. There seems to be no exact number because there are variances by brand. So now we basically know about how many cans one has to gather together to make a pound a make some money.