import java.util.*;

public class Main {
	public static void main (String[] args) {
    	Scanner sc = new Scanner(System.in);
    	int n = sc.nextInt();
    	double p = sc.nextDouble();
    	double[] primes = new double[n + 1];
    	Arrays.fill(primes, 1.0);
    	double ans = 0;
    	for (int i = 2; i <= n; i++) {
    	    ans += primes[i];
    	    for (int j = 2; j * i <= n; j++) {
    	        primes[i * j] *= (1 - p);
    	    }
    	}
    	System.out.print(ans);
	}
}