Midgard encounters the problem of inclement weather. This year the Meteorological Department forecasts that there will be n cubic units of rain in the Midgard area.

Midgard has area height information in the form of an array $[$ h $],$ where each h indicates the area's height.

Find the height of the water level from the point with the lowest surface.

With,

Input $1$ : Rainfall amount

Input $2$ : Midgard floor height information.

Note :

$1.$ The water surface will be at the same height at every point.

Example :

a$.$ Input$1$ : $11$

Input $2$ : $[3,5,4,5,2]$

Output : $4\mathrm{.}00$

B$.$ Input$1$ : $5$

Input $2$ : $[1,4,3,6]$

Output : $3\mathrm{.}33$

C$.$ Input $1$ : $5$

Input $2$ : $[1,2,4,2,3]$

Output : $2\mathrm{.}25$