5561: Horizon地平线（ABC239A）
内存限制：1024 MB
时间限制：2.000 S
评测方式：文本比较
命题人：
提交：1
解决：1
题目描述
Problem Statement：
Assuming that the horizon seen from a place $x$ meters above the ground is $\sqrt{x(12800000+x)}$ meters away, find how many meters away the horizon seen from a place $H$ meters above the ground is.
Assuming that the horizon seen from a place $x$ meters above the ground is $\sqrt{x(12800000+x)}$ meters away, find how many meters away the horizon seen from a place $H$ meters above the ground is.
假设从地面上方 x 米处看到的地平线距离为 $\sqrt{x(12800000+x)}$ 米，求从地面上方 H 米处看到的地平线距离是多少米。
输入
H
输出
Output：
Print the answer.
Your answer will be considered correct when the absolute or relative error from the judge's answer is at most $10^{-9}$.
输出所求答案，保留9位小数。当你的答案与评判答案的绝对误差或相对误差不超过10^-9时，将被视为正确。
Print the answer.
Your answer will be considered correct when the absolute or relative error from the judge's answer is at most $10^{-9}$.
输出所求答案，保留9位小数。当你的答案与评判答案的绝对误差或相对误差不超过10^-9时，将被视为正确。
样例输入 复制
333样例输出 复制
65287.907678222提示
Constraints：
- $1 \leq H \leq 10^5$
- $H$ is an integer.
数据范围：- $1 \leq H \leq 10^5$ H是一个整数
- $1 \leq H \leq 10^5$
- $H$ is an integer.
数据范围：- $1 \leq H \leq 10^5$ H是一个整数