#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};

//約数の個数の列挙
//nlogn
vector<int> num_divisors_list(int n){
    vector<int> num(n+1);
    for(int i = 1; i <= n; i++){
        for(int j = i; j <= n; j += i){
            num[j]++;
        }
    }
    return num;
}


int main(void){
    int N;
    double p;
    cin >> N >> p;
    double ans = 0.0;
    vector<int> num = num_divisors_list(1000010);
    for(int i = 2; i <= N; i++){
        int x = num[i];
        x -= 2;
        ans += pow((1.0-p), x);
    }
    cout << fixed << setprecision(10) << ans << endl;
}