Seconds to Decimal Hours

Version: Phuoc Hung OJ Extended

Problem Statement

Given a duration $s$ in seconds, convert it to decimal hours using $h=\dfrac{s}{3600}$. Print the number of hours with exactly 4 decimal places; do not split it into hours, minutes and seconds.

Input

The only line contains real number $s$, the duration in seconds.

Output

Print decimal hours with exactly 4 decimal places.

Subtasks

• Subtask 1 (100 points): $0\le s\le10^{12}$.

Examples

Example 1

Input

3600

Output

1.0000

Explanation. Substituting 3600 into s / 3600 gives approximately 1. The required output formatting produces 1.0000.

Example 2

Input

5400

Output

1.5000

Explanation. Substituting 5400 into s / 3600 gives approximately 1.5. The required output formatting produces 1.5000.

Example 3

Input

1

Output

0.0003

Explanation. Substituting 1 into s / 3600 gives approximately 0.000277777777778. The required output formatting produces 0.0003.