#include "bits/stdc++.h"
using namespace std;
#define FOR(i,j,k) for(int (i)=(j);(i)<(int)(k);++(i))
#define rep(i,j) FOR(i,0,j)
#define each(x,y) for(auto &(x):(y))
#define mp make_pair
#define mt make_tuple
#define all(x) (x).begin(),(x).end()
#define debug(x) cout<<#x<<": "<<(x)<<endl
#define smax(x,y) (x)=max((x),(y))
#define smin(x,y) (x)=min((x),(y))
#define MEM(x,y) memset((x),(y),sizeof (x))
#define sz(x) (int)(x).size()
#define pb push_back
typedef long long ll;
typedef pair<int, int> pii;
typedef vector<int> vi;
typedef vector<ll> vll;

int main(){
    ios::sync_with_stdio(false);
    cin.tie(0);

    int N;
    double p;
    cin >> N >> p;

    vi dp(N + 1);
    vector<double> power(1000, 1);
    for (int i = 1; i < 1000; ++i)power[i] = power[i - 1] * (1 - p);

    double ans = 0;
    for (int i = 2; i <= N; ++i) {
        ans += power[dp[i]];
        for (int j = i + i; j <= N; j += i) {
            dp[j]++;
        }
    }
    cout << setprecision(20) << ans << endl;
}