EOJ-自适应编程学习平台

Write a program to calculate integer square roots.

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

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

$122333444455555^{0.5} ≈ 11060445.038765619$