#include <bits/stdc++.h>
using namespace std;
using ll = long long;
using P = pair<ll, ll>;
#define rep(i, n) for (int i = 0; i < (int)(n); i++)
int main()
{
    int n;
    double p;
    cin >> n >> p;
    double ans = 0;
    for(int i = 2; i <= n; i++)
    {
        int cnt = 0;
        for(int j = 2; j * j <= i; j++)
        {
            if(i % j == 0)
            {
                cnt++;
                if(i / j != j) cnt++;
            }
        }
        ans += pow((1-p), cnt);
    }
    cout << fixed << setprecision(10) << ans << endl;
}