/**
 *   @FileName	a.cpp
 *   @Author	kanpurin
 *   @Created	2021.04.22 15:38:29
**/

#include "bits/stdc++.h" 
using namespace std; 
typedef long long ll;

int main() {
    int n;
    double p;cin >> n >> p;
    vector<int> a(n+1);
    double ans = 0;
    for (int i = 2; i <= n; i++) {
        for (int j = i+i; j <= n; j+=i) {
            a[j]++;
        }
        ans += pow(1-p,a[i]);
    }
    printf("%.10f\n",ans);
    return 0;
}