#include "bits/stdc++.h"
#define REP(i,n,N) for(int i=(n); i<(N); i++)
#define RREP(i,n,N) for(int i=(N-1); i>=n; i--)
#define CK(n,a,b) ((a)<=(n)&&(n)<(b))
#define ALL(v) (v).begin(),(v).end()
#define p(s) cout<<(s)<<endl
#define p2(a,b) cout<<(a)<<" "<<(b)<<endl
typedef long long ll;
using namespace std;
const int inf=1e9;

int yaku[1000010];
int main(){
    double ans=0,p;
    int N;
    cin>>N>>p;
    REP(i,2,N+1){
        for(int j=i*2;j<=N;j+=i){
            yaku[j]++;
        }
    }
    REP(i,2,N+1){
        ans+=pow(1-p,yaku[i]);
    }
    printf("%.6lf\n", ans);

    return 0;
}