#include<iostream>
#include<algorithm>
#include<vector>
#include<string>
#include<utility>
#include<map>
#include<set>
#include<queue>
#include<stack>
#include<functional>
#include<math.h>
#include<random>
using namespace std;
#define N (1000000000+7)
#define M 998244353
#define INF 1e16
typedef long long ll;
typedef pair<int,int> P;
 
const int inf = (int)1e9;

ll A(ll x){
    if(x>=0)return x;
    else return -x;
}
 
ll gcd(ll a, ll b) {
	if (b > a) {
		ll tmp = b;
		b = a;
		a = tmp;
	}
	if (a%b == 0)return b;
	else return gcd(b, a%b);
}
 
 

bool prime[1000010];
ll cnt[1000010];
void furui() {
	int i = 2;
	while (i < 1000010) {
		int j = 2;
		while (j*j <= i && !prime[i]) {
			if (i%j == 0) {
				prime[i] = true;
				break;
			}
			else j++;
		}
		int z = 2;
		while (!prime[i]) {
			if (i*z < 1000010) {
				prime[i*z] = true;
				z++;
			}
			else break;
		}
		i++;
	}
}
 
int main(void){
	ll n;
	double p;
	cin>>n>>p;
	double ans = 0.0;
	int i = 2;
	while (i <= n) {
		int j = 2;
		while (j*j <= i && !prime[i]) {
			if (i%j == 0) {
				prime[i] = true;
				break;
			}
			else j++;
		}
		if(!prime[i])ans+=1.0;
		else {
			double x= 1.0;
			for(ll k=0;k<cnt[i];k++){
				x=(double)x*(1.0-p);
			}
			ans+=x;
		}
		int z = 2;
		while (i*z <= n) {
			if(!prime[i])prime[i*z] = true;
			cnt[i*z]++;
			z++;
		}
		i++;
	}
	printf("%.10lf\n",ans);
    return 0;
}