Time Limit: 1 s
Memory Limit: 128 MB

Submission：17
AC：13
Score：99.22

Amtel has announced that it will release a 128-bit computer chip by 2010, a 256-bit computer by 2020, and so on, continuing its strategy of doubling the word-size every ten years. (Amtel released a 64-bit computer in 2000, a 32-bit computer in 1990, a 16-bit computer in 1980, an 8-bit computer in 1970, and a 4-bit computer, its first, in 1960.)

Amtel will use a new benchmark - the *Factstone* - to advertise the vastly improved capacity of its new chips. The *Factstone* rating is defined to be the largest integer *n* such that *n!* can be represented as an unsigned integer in a computer word.

Given a year *1960 ≤ y ≤ 2160*, what will be the *Factstone* rating of Amtel's most recently released chip?

There are several test cases. For each test case, there is one line of input containing *y*. A line containing 0 follows the last test case. For each test case, output a line giving the Factstone rating.

input

1960
1981
0

output

3
8