#include <bits/stdc++.h>

#define DEBUG(x) cerr << #x << "=" << x << endl
#define BINARY(x) static_cast<bitset<16> >(x)
#define rep(i,n) for(int i=0;i<(int)(n);i++)
#define REP(i,m,n) for (int i=m;i<(int)(n);i++)
#define if_range(x, y, w, h) if (0<=(int)(x) && (int)(x)<(int)(w) && 0<=(int)(y) && (int)(y)<(int)(h))
#define is_in(x, y, w, h) (0<=(int)(x) && (int)(x)<(int)(w) && 0<=(int)(y) && (int)(y)<(int)(h))
#define ALL(a) (a).begin(),(a).end()

int dx[4]={0, -1, 1, 0}, dy[4]={-1, 0, 0, 1};
using namespace std;
typedef long long ll;
typedef vector<vector<int> > VVI;
const int INF = 1e9;
typedef pair<int, int> PII;

int d[1000001];

int main()
{
    int N; cin >> N;
    double P; cin >> P;
    
    for (int i=2; i<=N; i++) {
        for (int j=i*2; j<=N; j+=i) {
            d[j]++;
        }
    }

    double ans = 0;
    for (int i=2; i<=N; i++) {
        ans += pow(1-P, d[i]);
    }
    cout << fixed << setprecision(10);
    cout << ans << endl;
}