#include<bits/stdc++.h>
typedef long long ll;
using namespace std;
int INF = 1LL << 30;
int MOD = 1e9+7;
/*
template<size_t max_N>
struct P{
    int count[max_N];
    //size_t counter = 0;
    constexpr P() : count() {
        for(int i = 2; i <= max_N; ++i){
            for(int j = i; j <= max_N; j += i){
                count[j]++;
            }
        }
    }
};
*/
int cnt[1000010];
main(){
    //constexpr auto c = P<10010>();
    int N;
    double p;
    cin >> N >> p;

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

    double ans = 0;
    for(int i = 2;i <= N;i++){
        if(cnt[i] == 0)ans += 1;
        else ans += pow(1 - p, cnt[i]);
    }
    printf("%.9lf\n" ,ans);
}