#include <iostream>
#include <iomanip>
#include <cstdint>
#include <vector>

using namespace std;

int main()
{
	cin.tie(nullptr);
	ios::sync_with_stdio(false);

	uint32_t N, i, j;
	double p;
	cin >> N >> p;

	vector<double> dp(N + 1, 1);
	double ans = 0;
	dp[0] = dp[1] = 1;
	for (i = 2; i <= N; ++i)
	{
		ans += dp[i];
		for (j = i * 2; j <= N; j += i)
			dp[j] *= 1 - p;
	}

	cout << fixed << setprecision(10) << ans << '\n';
	return 0;
}