#include<bits/stdc++.h>
using lint=long long;
int main(){
    std::cin.tie(nullptr);std::ios_base::sync_with_stdio(false);
    std::cout.setf(std::ios_base::fixed);std::cout.precision(15);
    lint n;double p;std::cin>>n>>p;
    std::vector<double>sieve(n+1,1);
    sieve.at(0)=0;
    sieve.at(1)=0;
    for(lint i=2;i<=n;i++){
        for(lint j=2*i;j<=n;j+=i){
            sieve.at(j)*=1-p;
        }
    }
    std::cout<<std::accumulate(sieve.begin(),sieve.end(),0.0)<<'\n';
}