#include <bits/stdc++.h> 
using namespace std;
typedef long long ll;
typedef pair<int,int> Pint;
typedef pair<ll, ll> P;
//typedef pair<int, pair<int, int>> P;
//typedef tuple<int,int,int> T;
ll INFL = 1000000000000000010;//10^18 = 2^60
int INF = 2147483600;//10^9
ll MOD  = 1000000007;
vector<int> dy = {0,0,1,-1};
vector<int> dx = {1,-1,0,0};

int divisor(ll n){
    int res = 0;
    for(ll i = 1; i * i <= n; i++){
        if(n % i == 0){
            res++;
            if(i != n/i) res++;
        }
    }
    return res;
}



int main(void){
    int N;
    double p;
    cin >> N >> p;
    double ans = 0.0;
    for(int i = 2; i <= N; i++){
        int x = divisor(i);
        x -= 2;
        ans += pow((1.0-p), x);
    }
    cout << ans << endl;
}