#pragma GCC optimize ("O3")
#include "bits/stdc++.h"

using namespace std;
using ll = long long int;

int N;
double P;

int cnt[1000010];

void generate(){
    cnt[1] = 1;
    for (int i = 2; i <= N; ++i){
        for (int j = i; j <= N; j += i){
            ++cnt[j];
        }
    }
}

int main(){
    cin >> N >> P;
    
    generate();
    
    double ans = 0;
    for (int i = 2; i <= N; ++i){
        ans += pow(1.0-P, cnt[i]-1);
        
    }
    
    printf("%.10f\n", ans);
    
    return 0;
}