#include <bits/stdc++.h>
typedef long long ll;
using namespace std;
#define DUMP(x)  cout << #x << " = " << (x) << endl;
#define FOR(i, m, n) for(ll i = m; i < n; i++)
#define IFOR(i, m, n) for(ll i = n - 1; i >= m; i-- )
#define REP(i, n) FOR(i,0,n)
#define IREP(i, n) IFOR(i,0,n)
#define FOREACH(x,a) for(auto& (x) : (a) )
#define ALL(v) (v).begin(), (v).end()
#define SZ(x) ll(x.size())

double bpow(double a , ll b){
  if (b == 0) return 1;
  double ret, t;
  if (b%2 == 0){
    t = bpow(a, b/2);
    ret = t*t;
  }else{
    t = bpow(a, (b-1)/2);
    ret = a*t*t;
  }
  return ret;
}

int main(){
  ll n; cin >> n;
  double p; cin >> p;
  //d[i] = iの正の約数の個数
  vector<ll> d(n+1,0);
  FOR(i,1,n+1){
    for(ll j=1; i*j<=n; j++){
      d[i*j]++;
    }
  }
  double ans = 0.0;
  FOR(k,2,n+1){
    ans += bpow(1-p,d[k]-2);
  }
  cout << fixed << setprecision(10) << ans << endl;
}