#include <bits/stdc++.h>
using namespace std;
#define rep(i, n) for (int i = 0; i < (int)(n); i++)
#define llong long long

int main() {
    int n;
    double p;
    cin >> n >> p;

    vector<double> dups(n+1, 1);
    dups[0] = 0;
    dups[1] = 0;
    for(int i=2; i<=n; i++) {
        for(int j=i*2; j<=n; j+=i) {
            dups[j] *= (1.0-p);
        }
    }

    printf("%8f\n", accumulate(dups.begin(), dups.end(), 0.0));
}