#include <bits/stdc++.h>
using namespace std;
const int N=1e6 + 10;
int a[N];
int main(){
int n; double p; cin >>n>>p;
a[0] = a[1] = 0;
for(int i=2;i<N;i++)a[i]=1;
for (int i = 2; i < N; i++) {
  for (int j = i * 2; j < N; j += i) {
    a[j] *= a[j] * (1 - p);
  }
}
double s = 0;
for (int i=2;i<=n;i++) {
s += a[i];
}
printf("%.9f\n", s);
}