#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
typedef unsigned long long ull;
typedef vector<int> VI;
typedef vector<VI> VVI;
#define REP(i, n)           for(int(i)=0;(i)<(n);++(i))
#define FOR(i, f, t)        for(int(i)=(f);(i)<(t);(++i))
#define RREP(i, n)          for(int(i)=(n)-1;(i)>=0;--(i))
const int MOD = int(1e9+7);

int N;
double p;

double pp[1000100];

int main(){
    do { cin.tie(0); ios_base::sync_with_stdio(false); } while(0);
    cin >> N >> p;
    REP(i,N+1) pp[i] = 1.0;

    double res = 0;
    for(int i = 2; i <= N; i++){
        res += pp[i];
        for(int j = i+i; j <= N; j+=i){
            pp[j] *= (1-p);
        }
    }
    cout << fixed << setprecision(15) << res << endl;
    return 0;
}