It's not a secret that the number 2n for any nonnegative integer n in binary notation has a very simple form - one in the high bit and then follow n zeros. In the decimal system these numbers are not so unvaried, but even among them there are those that start with one.

Calculate how many such numbers in a given range.

Input

Two integers n1 and n2 (0 ≤ n1 < n2 ≤ 109), separated with a space.

Output

Print, how many numbers are power of two, belong to the range [2n1; 2n2] and in decimal notation their first digit is one.