#include<iostream>
#include<cstdio>
using namespace std;
const int BUF = 1000005;

int N;
double p;

void read() {
    cin >> N >> p;
}


void work() {
    double sum = 0;

    for (int i = 2; i <= N; ++i) {
        double toAdd = 1;
        for (int j = 2; j * j <= i; ++j) {
            if (j * j == i) {
                toAdd *= (1 - p);
            }
            else if (i % j == 0) {
                toAdd *= (1 - p);
                toAdd *= (1 - p);
            }
        }
        sum += toAdd;
    }
    
    printf("%.10lf\n", sum);
}


int main() {
    read();
    work();
    return 0;
}