#include <bits/stdc++.h>
using namespace std;
template<class T> inline bool chmax(T& a, T b) { if (a < b) { a = b; return true; } return false; }
template<class T> inline bool chmin(T& a, T b) { if (a > b) { a = b; return true; } return false; }
using ll = long long;
using P = pair<ll, ll>;
const long double PI = acos(-1.0L);
ll GCD(ll a, ll b) { return b?GCD(b, a%b):a; }
ll LCM(ll a, ll b) { return a/GCD(a, b)*b; }

int n;
int d[1000100];

int main() {
    cin >> n;
    long double p; cin >> p;
    long double ans = 0.0;
    memset(d, 0, sizeof(d));
    for(int i = 2; i <= n; ++i) {
        for(int m = i; m <= n; m+=i) {
            d[m]++;
        }
        ans += powl((1LL-p), d[i]-1);
    }
    cout << setprecision(14) << ans << endl;
}