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

int main(){
    int N; cin >> N;
    double p; cin >> p;
    double ans=0;
    for(int i=2;i<=N;i++){
        vector<int> divisor;
        for(int j=1;j*j<=i;j++){
            if(i%j==0){
                divisor.push_back(j);
                if(j!=i/j) divisor.push_back(i/j);
            }
        }
        ans+=pow(1-p,divisor.size()-2);
    }
    cout << setprecision(10) << ans << endl;
}