#include <bits/stdc++.h>
using namespace std;
 
#define fi first
#define se second
#define pb push_back
using vi = vector <int>;
using ll = long long;
using pii = pair <int, int>;
//~ const ll mod = 998244353;
const ll mod = 1e9 + 7;
ll qpow(ll a, ll b, ll m = mod) { ll r = 1, t = a;
	for(; b; b /= 2) { if(b & 1) r = r * t % m; t = t * t % m; } return r; }

const int N = 1e6 + 11;
double f[N];

int main() {
	ios :: sync_with_stdio(false);
	
	int n; cin >> n;
	double p; cin >> p;
	fill(f, f + n + 1, 1);
	for(int i = 2; i <= n; i ++)
		for(int j = i * 2; j <= n; j += i)
			f[j] *= (1 - p);
	
	double ans = accumulate(f + 2, f + n + 1, 0.0);
	cout << fixed << setprecision(8) << ans << '\n';
}