#include <stdio.h>
#include <bits/stdc++.h>
#include <atcoder/all>
using namespace atcoder;
using mint = modint1000000007;
using namespace std;
#define rep(i,n) for (int i = 0; i < (n); ++i)
#define Inf 1000000000000000000

int main(){
	
	int N;
	double p;
	cin>>N>>p;
	
	vector<double> dp(N+1,1.0);
	
	double ans = 0.0;
	
	for(int i=2;i<=N;i++){
		ans += dp[i];
		for(int j=i;j<=N;j+=i){
			dp[j] *= 1.0 - p;
		}
	}
	
	cout<<fixed<<setprecision(10)<<ans<<endl;
	
	return 0;
}