46. Speed in km/hr

Difficulty: easy · Math

Problem

A runner covers a distance of 1000 metres in `t` seconds. Compute the runner's speed in km/hr. Speed in m/s is `1000 / t`; multiply by `18/5` to convert to km/hr. Print the result rounded to 2 decimal places (exact halves round up).

Input

A single line containing the integer `t` (seconds).

Output

Print the speed in km/hr with exactly two digits after the decimal point.

Example 1

Input:
100
Output:
36.00

Explanation: 1000 m in 100 s is 10 m/s; 10 * 18/5 = 36 km/hr, printed as 36.00.

Example 2

Input:
7
Output:
514.29

Explanation: 3600 / 7 = 514.2857..., which rounds to 514.29.

Constraints

- 1 <= t <= 10^6

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