Background

This is a test problem.

Description

Enter $3$ non-zero integers $x$, $y$ and $z$，output $w$，such that $x:y=z:w$.

Format

Input

Three integers $x$, $y$ and $z$, satisfying $1\leq x,y,z\leq 10^9$ .

Output

One integer $w$, such that $x:y=z:w$.

Samples

4 2 12

6

Limitation

1s, 1024KiB for each test case.