#include <bits/stdc++.h>
#include <atcoder/all>
using namespace atcoder;
using namespace std;
using ll=long long;
using ld=long double;
ld pie=3.14159265359;
ll mod=998244353;
ll inf=99999999999999999;
int main(){
    ll n;
    cin >> n;
    ld p;
    cin >> p;
    vector<ld>memo(n+1,1);
    for (ll i = 2; i <=n; i++)
    {
        for (ll j = 2; j >=0; j++)
        {
            if (i*j>n)
            {
                break;
            }
            memo[i*j]*=(1.0-p);
        }
    }
    ld ans=0;
    for (ll i = 2; i <=n; i++)
    {
        ans+=memo[i];
    }
    cout << setprecision(20) << ans << endl;
}