The input file contains at most 50001 lines of inputs. Each line contains two positive integers low and high $(0<low\le high\le 9\ast {10}^{18})$. Input is terminated by a line containing two zeroes.

For each line of input produce one line of output. This line contains an integer D, which denotes how many different values the function fzero(v) can have if $(low\le v\le high)$. Note: Illustration for Sample input 1: as 1! = 1, 2! = 2, 3! = 6, 4! = 24, 5! = 120, 6! = 720, 7! = 5,040, 8! = 40,320, 9! = 362,880, 10! = 3,628,800, so fzero(1) = 0, fzero(2) = 0, fzero(3) = 0, fzero(4) = 0, fzero(5) = 1, fzero(6) = 1, fzero(7) = 1, fzero(8) = 1, fzero(9) = 1 and fzero(10) = 2. So in this range (1 to 10) there are three different values of fzero(v): 0, 1 and 2.

3
1