#include <bits/stdc++.h>
#define GET_MACRO(a, b, c, NAME, ...) NAME
#define rep(...) GET_MACRO(__VA_ARGS__, rep3, rep2)(__VA_ARGS__)
#define rep2(i, a) rep3 (i, 0, a)
#define rep3(i, a, b) for (int i = (a); i < (b); i++)
#define repr(...) GET_MACRO(__VA_ARGS__, repr3, repr2)(__VA_ARGS__)
#define repr2(i, a) repr3 (i, 0, a)
#define repr3(i, a, b) for (int i = (b) - 1; i >= (a); i--)
#define chmin(a, b) ((b) < a && (a = (b), true))
#define chmax(a, b) (a < (b) && (a = (b), true))
using namespace std;
typedef long long ll;

int d[1010101];

int main() {
	int N;
	double p;
	cin >> N >> p;
	rep (i, 1, N + 1) for (int j = i; j <= N; j += i) {
		d[j]++;
	}
	double ans = 0;
	rep (i, 2, N + 1) {
		ans += pow(1 - p, d[i] - 2);
	}
	printf("%.20f\n", ans);
	return 0;
}