Amulet Split

Tina and Salamander need magic to return the last creature to the suitcase. After a long search, they found a magical amulet shaped like a right triangle. The amulet can be split into two parts, and its magical power is then divided equally between the parts. But the two parts must have equal area, or all of the amulet's power disappears.

Salamander and Tina placed the amulet on a plane so that its vertices are (0, 0), ($X$, 0), and (0, $Y$). Salamander has a device with a very thin blade that can split the amulet along the vertical line $x=\text{const}$. Find the value of $x$ that splits the amulet into two parts of equal area.

A single line contains the numbers $X$ and $Y$, the coordinates of the amulet's vertices ($1 \le X, Y \le 10^9$).

Print a single line with the coordinate $x$ where the amulet should be cut. The answer is accepted if its absolute or relative error does not exceed $10^{-6}$.

The figure shows the case $X=4$, $Y=3$. The line $x = 1.171572875$ splits the amulet into two parts, each with area 3.