5 Guess Number 1

Description

You are given a hint to guess a positive number $x$, an integer ranging from $1$ to $n$.

Input

The first line contains a number $n$, indicating the range of the number (from $1$ to $n$).
The second line contains a Python expression that implies $x$.

Output

One integer $x$ to get full points. To get a few points without guessing, give a 0 as the answer.

For each case, write your answer into a file date#.usr. Either submit them directly within the editor on page, or pack all answer files into a single zip and upload it.

Sample

Limits And Hints

本题中给出的 Python 表达式与 C++ 语义相同。表达式中 x 是一个整型变量,当 x 为正确答案时,表达式求值为 True;否则为 False。保证答案惟一。

注: * Python 中 a ** b 表示计算 $a^b$。 * pi 的值为 $3.141592653589793$;三角函数使用弧度制。 * 给出的表达式可以直接在 Python 中 from math import * 后求值。 * 本题的测试数据中,in 文件是输出 $0$ 可得的分数百分比;out 文件是正确日期。在上传提交答案类题目时,如果 Special Judge 不需要 in/out 文件,可在 data.yml 中对应省略 inputFile/outputFile 项。 * 不保证 答案是一个公历日期。

Samples

Input 1

10 abs(x - 7) == 4

Output 1

3