Problem Statement

Takahashi is making a computer baseball game.
He will write a program that shows a batter's batting average with a specified number of digits.

There are integers A and $B, which satisfy 1 \leq A \leq 10$ and $0 \leq B \leq A$.
Let S be the string obtained as follows.

• Round off $\dfrac{B}{A}$ to three decimal digits, then write the integer part (1 digit), . (the decimal point), and the decimal part (3 digits) in this order, with trailing zeros.

For example, if A=7 and B=4, then $\dfrac{B}{A} = \dfrac{4}{7} = 0.571428\dots$ rounded off to three decimal digits is 0.571. Thus, S is 0.571.
You are given A and B as the input and asked to print S.

Input

The input is given from Standard Input in the following format:
A B

Output

Print S in the format specified in the Problem Statement. Note that answers in different formats will be considered wrong.

Constraints

• $1 \leq A \leq 10$
• $0 \leq B \leq A$
• A and B are integers.

Sample Input 1

7 4

Sample Output 1

0.571

As explained in the Problem Statement, $\dfrac{B}{A} = \dfrac{4}{7} = 0.571428\dots$ rounded off to three decimal digits is 0.571. Thus, S is 0.571.

Sample Input 2

7 3

Sample Output 2

0.429

$\dfrac{B}{A} = \dfrac{3}{7} = 0.428571\dots$ rounded off to three decimal digits is 0.429. (Note that it got rounded up.)
Thus, S is 0.429.

Sample Input 3

2 1

Sample Output 3

0.500

$\dfrac{B}{A} = \dfrac{1}{2} = 0.5$ rounded off to three decimal digits is again 0.5.
Thus, S is 0.500. Note that it must have three decimal places.

Sample Input 4

10 10

Sample Output 4

1.000

Sample Input 5

1 0

Sample Output 5

0.000

见题面 Input 部分

见题面 Output 部分