#include <cstdio>
#include <iostream>
#include <sstream>
#include <fstream>
#include <iomanip>
#include <algorithm>
#include <cmath>
#include <string>
#include <vector>
#include <list>
#include <queue>
#include <stack>
#include <set>
#include <map>
#include <bitset>
#include <numeric>
#include <limits>
#include <climits>
#include <cfloat>
#include <functional>
using namespace std;

int main()
{
    int n;
    double p;
    cin >> n >> p;

    double ret = 0;
    vector<double> dp(n+1, 1.0);
    for(int i=2; i<=n; ++i){
        ret += dp[i];
        for(int j=i*2; j<=n; j+=i)
            dp[j] *= 1.0 - p;
    }
    printf("%.10f\n", ret);

    return 0;
}