import java.util.Scanner;

public class Christian
{
    public static void main(String[] args)
    {
        Scanner input = new Scanner(System.in);

        System.out.print("Enter a number x to compute e^x: ");
        int x = input.nextInt();
        System.out.print("Enter a Number of Terms: ");
        double n = input.nextDouble();

        double sum = 0;

        for(int i = 0; i < n; ++i)
        {
            sum += (Math.pow(x, i))/factorial(i);
        }

        System.out.print(sum);
    }

    public static double factorial(double n)
  {
      int ret = 1;
      for (double i = 1.0; i <= n; ++i) ret *= i;
      return ret;
  }
}