# 程序设计能力实训

1005. SQUINT

Write a program to calculate integer square roots.

### 输入格式

Its only line consists of an integer $0 \leqslant n \leq 2^{63}$ .

### 输出格式

Its only line consists of the smallest nonnegative integer $q$ such that $q^2 \geqslant n$ .

### 样例

Input
122333444455555

Output
11060446


### 提示

$122333444455555^{0.5} ≈ 11060445.038765619$