Captain Jack Sparrow is stranded on an island, awaiting rescue. Suppose thatthe probability for a ship to come by

Captain Jack Sparrow is stranded on an island, awaiting rescue. Suppose thatthe probability for a ship to come by in a particular day is 20%. Assumingeach day is independent of the next, for at least how many days should he wait(including the day in which he gets rescued) so that the probability of himbeing rescued within these days is 60% or more