# abc/(ab+bc+ac)

Given three positive integers $a$, $b$ and $c$ not exceeding $2^21$ by absolute value. Calculate the value of $\Big \lfloor \frac{abc}{ab+bc+ac} \Big \rfloor$ (i.e. the integer part of $\frac{abc}{ab+bc+ac}$).

## Input format

The input contains three integers $a$, $b$ and $c$.

## Output format

Print one integer - the answer to the problem.

## Sample

### Input

12 34 56

### Output

7