e-olymp
Problems

The height of triangle

The height of triangle

The area of triangle is S. The length of its base is a greater than its height. Find the height of triangle.

Input

Two integers S (0 < S100) and a (|a| ≤ 100).

Output

Print the height of triangle with two digits after the decimal point.

Time limit 1 second
Memory limit 128 MiB
Input example #1
15 1
Output example #1
5.00