#include <cstdio>
#include <cmath>
using namespace std;
int divisor[1000010];
int main() {
    int N; double p;
    scanf("%d%lf", &N, &p);

    double ans = 0.0;
    for(int k=2; k<=N; k++) {
        for(int m=k; m<=N; m+=k) {
            divisor[m]++;
        }
        ans += pow(1-p, divisor[k] - 1);
    }
    printf("%.12f\n", ans);
    return 0;
}