#include "bits/stdc++.h"

using namespace std;

void solve()
{
	int n;
	double p;
	cin >> n >> p;
	vector<double> dp(n+1, 1);
	double ans = 0;
	for (int i = 2; i <= n; i++)
	{
		for (int j = 2*i; j <= n; j += i)
		{
			dp[j] *= 1 - p;
		}
		ans += dp[i];
		//cout << i << ' ' << dp[i] << endl;
	}
	cout << fixed << setprecision(9) << ans << endl;
}

int main(void)
{
	solve();
	//cout << "yui(*-v・)yui" << endl;
	return 0;
}