#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=1;j*j<=i;j++){
            if(i%j==0){
                divisor[i]++;
                if(j!=i/j) divisor[i]++;
            }
        }
    }
    for(int i=2;i<=N;i++){
        ans+=pow(1-p,divisor[i]-2);
    }
    cout << setprecision(10) << ans << endl;
}