#include <sstream>
#include <string>
#include <vector>
#include <map>
#include <algorithm>
#include <iostream>
#include <utility>
#include <set>
#include <cctype>
#include <queue>
#include <stack>
#include <cstdio>
#include <cstdlib>
#include <cmath>

#define INF 1000000000

using namespace std;
typedef long long ll;
int N;
double p;

const int MAXN = 1000100;
double a[MAXN];

int main(void) {
    cin >> N >> p;
    for (int i = 2; i <= N; i++) a[i] = 1;
    for (int i = 2; i <= N; i++) {
        for (int j = 2; i*j <= N; j++) {
            a[i*j] *= 1.0-p;
        }
    }
    double ans = 0;
    for (int i = 2; i <= N; i++) {
        ans += a[i];
    }
    printf("%.10lf\n", ans);
    return 0;
}