#define _USE_MATH_DEFINES
#define _CRT_SECURE_NO_WARNINGS
#include<stdio.h>
#include<string>
#include<iostream>
#include<iostream>
#include<cctype>
#include<cstdio>
#include<vector>
#include<stack>
#include<queue>
#include <algorithm>
#include<math.h>
#include<set>
#include<map>
#include <sstream>
#include<iomanip>
#include <ctype.h>
using namespace std;

//#include<bits/stdc++.h>

int p[1000008] = {};
int main() {

	
	int n;
	double a;
	cin >> n >> a;
	
	
	for (int i = 2; i <= n; i++) {
		for (int j = i; j <= n; j += i) {
			p[j]++;
		}
		//cout << i;
	}
	double w = 0;
	for (int i = 2; i <= n; i++)
		w += pow(1 - a, p[i] - 1);
	cout << setprecision(20);
	cout << w << endl;
		

	return 0;
}