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

double safe[1000010];

int main(){
	int N; cin >> N;
	double p; cin >> p;

	fill(begin(safe), end(safe), 1);

	for(int d=2;d<=N;d++)
		for(int n=2*d;n<=N;n+=d)
			safe[n] *= 1 - p;

	double res = 0;
	for(int n=2;n<=N;n++)
		res += safe[n];

	printf("%.10f\n", res);
	return 0;
}