#include <iostream>
#include <vector>
#include <algorithm>
#include <iomanip>
using namespace std;

#define RREP(i,s,e) for (int i = e-1; i >= s; i--)
#define rrep(i,n) RREP(i,0,n)
#define REP(i,s,e) for (int i = s; i < e; i++)
#define rep(i,n) REP(i,0,n)

int main() {
    int n;
    double p;
    cin >> n >> p;
    int cnt[n+1];
    double ans = 0;
    fill(cnt,cnt+n+1,0);
    REP (i,2,n+1) {
        for (int j = i * 2; j <= n; j += i)
            cnt[j]++;
        if (cnt[i] == 0)
            ans++;
        else
            ans += pow(1-p,cnt[i]);
    }
    cout << fixed << setprecision(10) << ans << endl;
    return 0;
}