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

typedef long long ll;
typedef unsigned long long ull;
typedef vector<int> veci;
typedef vector<string> vecs;

#define REP(i, a, n) for(ll i = a; i < n; i++)
#define rep(i, n) REP(i, 0, n)

template<class T> void read(T& a){cin >> a;}
template<class T> void rarr(T a, int n){for(int i = 0; i < n; i++) {cin >> a[i];}}
template<class T> void write(T a){cout << a << endl;}
template<class T> void warr(T a, int n, char* c = " "){cout << a[0];for(int i = 1; i < n; i++)cout << c << a[i];cout << endl;}

int main(void)
{
    int a[1000001] = {0};
	int n;
	double p;
	read(n);
	read(p);
	REP(i, 2, n+1) {
	    for(int j = i*2; j <= n; j += i) {
	        a[j]++;
	    }
	}
	double res = 0;
	REP(i, 2, n+1)
	    res += pow(1-p, a[i]);
	write(res);
	return 0;
}