#include<bits/stdc++.h>  
#define _USE_MATH_DEFINES       
using namespace std;  
typedef long long ll;  typedef float fl; typedef double db; typedef bool bl; 
typedef string st;  typedef pair<int,int> P; typedef int itn;
const int INF=100000000;  const ll INFx=1000000000000; ll MOD=1000000007;
int dx[4]={1,0,-1,0} , dy[4]={0,1,0,-1}; int DX[8]={0,-1,-1,-1,0,1,1,1} , DY[8]={1,1,0,-1,-1,-1,0,1}; 
string fi="01234567890123456789"; string al="abcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyz"; string AL="ABCDEFGHIJKLMNOPQRSTUVWXYZABCDEFGHIJKLMNOPQRSTUVWXYZ";
int factorial(int i){return i ? factorial(i-1)*i:1;};    
#define rep(i,n) for(int i=0;i<(n);++i)  
#define YesNo(flag) if(flag){cout<<"Yes"<<endl;}else{cout<<"No"<<endl;}

int main(){
 int n;cin>>n; fl p; cin>>p;
 if(n>=200){cout<<1;return 0;}
 fl v=0,ans=p;
 rep(i,n-1){
   v=(1-ans)*p;
   ans+=v;
   v=0;
 }
 cout<<fixed<<setprecision(6)<<ans<<endl;
}