import java.util.Arrays;
import java.util.Scanner;


public class Main_yukicoder144 {

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

        int n = sc.nextInt();
        double p = sc.nextDouble();

        double[] dp = new double[n];
        Arrays.fill(dp, 1.0);
        double ret = 0;
        for (int i = 2; i <= n; i++) {
        	for (int j = 2; i * j <= n; j++) {
        		dp[i * j - 1] *= (1.0 - p);
        	}
        	ret += dp[i - 1];
        }

        System.out.printf("%.7f\n", ret);
        
        sc.close();
    }
}