import java.util.Scanner;

public class yuki144 {

	public static void main(String[] args) {
		Scanner scanner = new Scanner(System.in);
		String[] strs = scanner.nextLine().split(" ", 0);
		int N = Integer.parseInt(strs[0]);
		double p = Double.parseDouble(strs[1]);

		double ans = 0.0;
		for(int i=2; i<=N; i++){
			int j = 2;
			int dNum = 0;
			while(j*j<=i){
				if(i%j==0){
					dNum += j*j!=i ? 2 : 1;
				}
				j += 1;
			}
			ans += Math.pow(1-p, dNum);
		}
		System.out.println(ans);
	}

}