#include <bits/stdc++.h>
using namespace std;

#ifdef LOCAL
    #define eprintf(...) fprintf(stderr, __VA_ARGS__)
#else
        #define eprintf(...) 42
#endif

#define rep(i,n) for(int i=0;i<(int)(n);i++)
#define repi(i,a,b) for(int i=(int)(a);i<(int)(b);i++)
#define all(x) (x).begin(),(x).end()
#define foreach(u,v) for(auto (u) : (v))
#define pb push_back
#define mp make_pair
#define mt make_tuple

typedef long long ll;
typedef pair<int, int> pii;
typedef vector<int> vi;
typedef vector<vi> vvi;
typedef pair<ll, ll> pll;
typedef vector<ll> vl;

const int inf = 1e9;
const ll linf = 1LL<<60;
const ll mod = 1e9 + 7;
const double eps = 1e-9;

/*
*/

int main()
{
  int n;
  cin >> n;

  double p;
  cin >> p;

  vi cnt(n+1);
  repi(i, 2, n+1){
    for(int j = 2; j <= n/i; j++){
      cnt[i*j]++;
    }
  }

  double ans = 0;
  repi(i, 2, n+1){
    ans += pow(1-p, cnt[i]);
//    cout << i << " : " << pow(1-p, cnt[i]) << endl;
  }

  printf("%.9f\n", ans);

  return 0;
}