Average Speed over a Trip

Version: Phuoc Hung OJ Extended

Problem Statement

A trip covers distance $d$ in time $t>0$. Its average speed is $v=\dfrac dt$. Compute $v$ and print exactly 3 decimal places. The result has the input distance unit divided by the input time unit.

Input

The only line contains real distance $d$ and time $t$, in that order.

Output

Print the average speed with exactly 3 decimal places.

Subtasks

• Subtask 1 (100 points): $0\le d\le10^{12}$; $t>0$.

Examples

Example 1

Input

100 2

Output

50.000

Explanation. Substituting 100, 2 into d / t gives approximately 50. The required output formatting produces 50.000.

Example 2

Input

12.5 0.5

Output

25.000

Explanation. Substituting 12.5, 0.5 into d / t gives approximately 25. The required output formatting produces 25.000.

Example 3

Input

1 3

Output

0.333

Explanation. Substituting 1, 3 into d / t gives approximately 0.333333333333. The required output formatting produces 0.333.