#pragma GCC optimize("O3")
#pragma GCC optimize("Ofast")
#pragma GCC optimize("unroll-loops")
#pragma GCC target("avx,avx2")
#include <bits/stdc++.h>
#define INF 1000000001LL
#define LNF 1000000000000000001LL
#define MOD 1000000007LL
#define MAX 502
#define long long long
#define all(x) x.begin(),x.end()
using namespace std;

int main()
{
	ios_base::sync_with_stdio(0); 
    cin.tie(0);

    int n;
    double p;
    cin >> n >> p;
    p = 1-p;
    vector<int> cnt(n+1);

    for(int i = 2; i<=n; i++)
    {
        for(int j = i+i; j<=n; j+=i)
            cnt[j]++;
    }

    double res = 0;

    vector<double> pow(10000);

    pow[0] =1;
    for(int i =1; i<10000; i++)
    {
        pow[i] = pow[i-1]*p;
    }

    for(int i = 2; i<=n; i++)
    {
        res+=pow[cnt[i]];
    }
    cout << fixed << setprecision(10) << res << endl;
    return 0;
}