+28 Jody and Shelli each receive a box of buttons on Saturday and on Sunday. Each button is either red or white, and the number of buttons in each of the four boxes is from 1 to 100 inclusive. On both days, the percentage of red buttons in Jody's box is greater than the percentage of red buttons in Shelli's box. If J% of Jody's total number of buttons are red and S% of Shelli's total number of buttons are red, what is the least possible value of J – S. Express your answer to the nearest integer.
