#include "bits/stdc++.h"
using namespace std;

int main() {
	int N;
	double p;
	cin >> N >> p;
	double ans = 0;
	for (int i = 2; i <= N; i++)
	{
		int divisor = 1;
		int temp = i;
		for (int j = 2; j * j <= temp; j++)
		{
			if (temp % j == 0){
				int count = 0;
				while (temp%j == 0){
					count++; temp /= j;
				}
				divisor *= count + 1;
			}
		}
		if (temp != 1) divisor *= 2;
		if (divisor == 2) ans += 1;
		else ans += pow(1 - p, divisor - 2);

	}
	printf("%.14f\n", ans);
}