#include "bits/stdc++.h"
using namespace std;
#define ll long long int
#define rep(i,n) for( int i = 0; i < n; i++ )
#define rrep(i,n) for( int i = n; i >= 0; i-- )
#define REP(i,s,t) for( int i = s; i <= t; i++ )
#define RREP(i,s,t) for( int i = s; i >= t; i-- )
#define dump(x)  cerr << #x << " = " << (x) << endl;
#define INF 2000000000
#define mod 1000000007
#define INF2 1000000000000000000


double L[1000001] = {};

int main(void)
{
    cin.tie(0);
    ios::sync_with_stdio(false);
	int N; cin >> N;
	double p; cin >> p;
	rep(i, N + 1) L[i] = 1;
	L[0] = 0;
	L[1] = 0;
	for(int i = 2; i <= N; i++) {
		int j = 2;
		while (i * j <= N) {
			L[i * j] *= 1 - p;
			j++;
		}
	}
	double ans = 0;
	rep(i, N + 1) ans += L[i];
	//rep(i, N + 1) cout << i << " " << L[i] << endl;
	cout << fixed << setprecision(14);
	cout << ans << endl;

    return 0;
}