Objective
In this challenge, we learn about Poisson distributions. Check out the Tutorial tab for learning materials!
Task
A random variable, , follows Poisson distribution with mean of . Find the probability with which the random variable is equal to .
Input Format
The first line contains 's mean. The second line contains the value we want the probability for:
2.5
5
If you do not wish to read this information from stdin, you can hard-code it into your program.
Output Format
Print a single line denoting the answer, rounded to a scale of decimal places (i.e., format).