#include<stdio.h>
#include<math.h>
int main()
{
	int n;
	double p;
	scanf("%d %lf", &n, &p);
	p = 1 - p;
	int v[1000006], i, j;
	double ans = 0;
	for (i = 0; i <= n; i++)
		v[i] = 0;
	v[0] = v[1] = 0;
	for (i = 2; i <= n; i++)
	{
		for (j = 2 * i; j <= n; j += i)
			v[j]++;
		ans += pow(p, v[i]);
	}
	printf("%.20lf\n", ans);
	return 0;
}