1034. Factstone Benchmark

单点时限: 2.0 sec

内存限制: 256 MB

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 $1960 \le y \le 2160$, what will be the Factstone rating of Amtel’s most recently released chip?

输入格式

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.

输出格式

For each test case, output a line giving the Factstone rating.

样例

Input
1960
1981
0
Output
3
8

45 人解决,53 人已尝试。

75 份提交通过,共有 128 份提交。

3.2 EMB 奖励。

创建: 18 年,4 月前.

修改: 6 年,6 月前.

最后提交: 9 月,1 周前.

来源: Waterloo local 2005.09.24

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