it Bubble Cup final season farmer Johnny Bubbles harvest bubble the bubble rectangular bubblefield form N x M square parcel divide n row M column the parcel ith row jth column yield a_ij bubblesJohnny bubble available special selfdriving bubble harvester manually position beginning row column automatically harvest bubble row column once harvester reach end row column stop reposition the harvester pass parcel number time collect bubble parcel onceJohnny busy farmer available manually position harvester time day Johnny impatient want harvest bubble possible dayplease help Johnny calculate maximum number bubble collect day