#include <bits/stdc++.h>
#define REP(i, s, n) for (int i = s; i < (int)(n); i++)
#define ALL(a) a.begin(), a.end()
#define MOD 1000000007
using namespace std;
using ll = long long;

int main() {
    int N; double P; cin >> N >> P;

    vector<int> divisor(N + 1, 0); double ans = 0;
    REP(i, 2, N + 1) {
        for (int j = i + i; j <= N; j += i) {
            divisor[j]++;
        }
        ans += pow(1 - P, divisor[i]);
    }
    
    cout << fixed << setprecision(15);
    cout << ans << endl;
    return 0;
}