$.$ Length Converter

$01.$

$02.$

$40$

Problem Statement

You are given two integers unit and km$.$ Your task is to convert input kilometre km value as follows:

If unit $1,$ then convert kilometre to metre where $1$km $1000$m

If unit $2,$ then convert kilometre to centimetre where Ikm $100000$cm

If unit $3,$ then convert kilometre to millimetre where $1$km $1000000$mm

Print the converted value.

Input Format:

The input consists of a single line:

The line contains two integers unit and km

The input will be read from the STDIN by the candidate

Output Format:

Print the converted value.

The output will be matched to the candidate's output printed on the STDOUT

Constraints:

$15$ unit $3.$

$15$ km $<=10$

Example:

Input:

$12$ Output:

$2000$

Explanation:

Since unit $1,$ kilometre is converted to metre, metre $210002000.$ Thus, output is $2000.$

Sample input $242$

Sample Outp