using System;
public class Program
{
public static void Main()
int n;
Console.WriteLine("Please enter a positive integer: ");
int userInput = Convert.ToInt32(Console.ReadLine());
int val = userInput;
n = userInput;
while (userInput > 0)
for (int i = n - 1; i > 0; i--){
n*= i;
userInput--;
}
Console.WriteLine($"The factorial of {val} is {n}.");