#include<iostream>
#include<string>
#include<vector>
#include<algorithm>
#include<bitset>
#include<set>
#include<map>
#include<stack>
#include<queue>
#include<deque>
#include<list>
#include<iomanip>
#include<cmath>
#include<cstring>
#include<functional>
#include<cstdio>
#include<cstdlib>
using namespace std;

#define repr(i, a, b) for (int i = (int)(a); i < (int)(b); i++)
#define rep(i, n) repr(i, 0, n)
#define INF 2e9
#define MOD 1000000007
//#define MOD 998244353
#define LINF (long long)4e18
#define jck 3.141592

const double EPS = 1e-10;

using ll = long long;
using Pi = pair<int,int>;
using Pl = pair<ll,ll>;


int main(){
    cout << fixed << setprecision(7);
    int N; cin >> N;
    double p; cin >> p;
    double ans = 0;
    vector<int> div(N+1);
    repr(i,2,N+1){
        for(int j = i; j <= N; j+=i){
            div[j]++;
        }
        double now = 1.0;
        now *= pow(1-p,(double)(div[i]-1));
        ans += now;
    }
    cout << ans << endl;

}