#include <bits/stdc++.h>
#define FOR(i,a,b) for(int i = (a); i < (b); ++i)
#define REP(i,n) FOR(i,0,n)
#define RREP(i,n) for(int i = (n) - 1; (i) >= 0; --i)
#define SZ(n) (int)(n).size()
#define ALL(n) (n).begin(), (n).end()
#define MOD LL(1e9 + 7)
#define INF 100000000
using namespace std;
typedef long long LL;
typedef vector<int> VI;
typedef pair<int, int> PI;

int a[1000001];

int main() {
	int n;
	double p;
	cin >> n >> p;
	for (int i = 2; i <= n; ++i) {
		for (int j = i * 2; j <= n; j += i) {
			a[j]++;
		}	
	}
	double ans = 0;
	FOR(i, 2, n + 1) {
		if (a[i] != 0) {
			ans += pow(1 - p, a[i]);
		}
		else {
			ans++;
		}
	}
	cout << setprecision(8) << fixed << ans << endl;
	return 0;
}