public class GeneralizedHarmonic
{
    public static void main(String[] args)
    {
        int n = Integer.parseInt(args[0]);
        int r = Integer.parseInt(args[1]);
        if (r >= 0 && n >= 0)
        {
            double h = 0;
            double breuk = 0;
            for (int i = 1; i <= n; i++ )
            {
                breuk = 1/(Math.pow(i,r));
                h += breuk;
            }
            System.out.println(h);
        }
        else
        {
            System.out.println("Negative number in one of the arguments");
        }       
    }
}