#include <iostream>
#include <cstdio>
#include <cstring>
#include <vector>
#include <deque>
#include <queue>
#include <array>
#include <set>
#include <map>
#include <cmath>
#include <complex>
#include <algorithm>
#include <numeric>
#include <utility>
#include <tuple>
#include <functional>
#include <bitset>
#include <cstdint>
#include <cassert>
#include <random>

using namespace std;
using i64 = int64_t;
using i32 = int32_t;

int n;
double p;
double dp[1000001];
int main() {
    cin >> n >> p;
    for (int i = 2; i <= n; ++i) {
        dp[i] = 1;
    }
    double ans = 0;
    for (int i = 2; i <= n; ++i) {
        for (int j = 2 * i; j <= n; j += i) {
            dp[j] *= 1 - p;
        }
        ans += dp[i];
    }
    printf("%.10f\n", ans);
    return 0;
}