#include <bits/stdc++.h>
#include<iostream>
#include<iomanip>
#include<string>
#include<algorithm>
#include<vector>
#include<set>
#include<list>
#include<queue>
#include<math.h>
#include<bitset>
using ll = long long;
using namespace std;

int divisor(int n) {
    int ret = 0;
    for (int i = 1; i * i <= n; i++) {
        if (n % i == 0) {
            ret++;
            if (i*i != n) ret++;
        }
    }
    return (ret - 2);
}

int main(){
    int n;
    double p;
    cin >> n >> p;
    vector<int> prime(n+1, 1);
    vector<double> yprime(n+1);
    prime[0] = 0, prime[1] = 0;
    for (int i = 2; i*i <= n; i++){
        if (prime[i]){
            for (int j = i*i; j <= n; j += i){
                prime[j] = 0;
            }
        }
    }
    
    for (int i = 2; i <= n; i++){
        int ex = 0;
        double tmp = 1.0;
        int fac = divisor(i);
        if (prime[i]) yprime[i] = yprime[i-1] + 1.0;
        else {
            yprime[i] = yprime[i-1] + pow(1-p, fac);
        }
    }

    cout << fixed << setprecision(7) << yprime[n] << endl;
}