Flight to Mars

Limits: 2 sec., 256 MiB

This statement was translated automatically from Ukrainian.

Ilona Maksymivna loves to travel very much. She was very happy to learn that there is an opportunity to fly to Mars. She began to plan her trip in detail.

Having learned that Mars is located at a distance of 225000000 km, she decided to calculate the travel time.

Input

The first line contains an integer \(v\) — the flight speed of the rocket (in km/h).

Output

In a single line, print a real number — the travel time (in hours).

The answer will be considered correct if its absolute or relative error does not exceed \(10^{-4}\).

Constraints

\(1 \le v \le 10^9\).

Samples