Body Mass Index

Version: Phuoc Hung OJ Extended

Problem Statement

Given weight $w$ in kilograms and height $h>0$ in metres, compute the body mass index $BMI=\dfrac{w}{h^2}$. Print the numeric index with exactly 2 decimal places; no BMI category classification is required.

Input

The only line contains real weight $w$ (kg) and height $h$ (m).

Output

Print BMI with exactly 2 decimal places.

Subtasks

• Subtask 1 (100 points): $0<w\le1000$; $0<h\le10$.

Examples

Example 1

Input

60 1.7

Output

20.76

Explanation. Substituting 60, 1.7 into w / h² gives approximately 20.7612456747. The required output formatting produces 20.76.

Example 2

Input

80 1.8

Output

24.69

Explanation. Substituting 80, 1.8 into w / h² gives approximately 24.6913580247. The required output formatting produces 24.69.

Example 3

Input

45 1.5

Output

20.00

Explanation. Substituting 45, 1.5 into w / h² gives approximately 20. The required output formatting produces 20.00.