程序设计能力实训

1005. SQUINT

单点时限: 2.0 sec

内存限制: 256 MB

Write a program to calculate integer square roots.

输入格式

Its only line consists of an integer .

输出格式

Its only line consists of the smallest nonnegative integer such that .

样例

Input
122333444455555
Output
11060446

提示

不限期开放

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