#include<bits/stdc++.h>
using namespace std;

double m_pow(double x,int n){ //べき乗
    double ans=1;
    while(n!=0){
        if(n&1) ans=ans*x;
        x=x*x;
        n=n>>1;
    }
    return ans;
}

int main(){
    int N; cin >> N;
    double p; cin >> p;
    double ans=0;
    int divisor[N+1]={};
    for(int i=2;i<=N;i++){
        for(int j=i*2;j<=N;j+=i){
            divisor[j]++;
        }
    }
    for(int i=2;i<=N;i++){
        if(divisor[i]==0) ans+=1;
        else ans+=m_pow(1-p,divisor[i]);
    }
    cout << setprecision(10) << ans << endl;
}