import java.util.*;

public class Main {
    public static void main(String[] args) throws Exception {
        Scanner koko = new Scanner(System.in);
        int n=koko.nextInt();
        double p = koko.nextDouble();
        double[] r = new double[n+1];
        Arrays.fill(r,1);
        double count=0;
        for(int i=2; i<n+1; i++){
            count=count+r[i];
            for(int j=2; j<=n/i; j++){
                r[j*i]=r[j*i]*(1-p);
            }
        }
        System.out.println(count);
    }
}