#include <bits/stdc++.h>
#define rep(i, n) for(int i = 0; i < (int)(n); i++)
#define rrep(i, a, b) for(ll i = a; i < (ll)(b); i++)
#define all(x) (x).begin(), (x).end()
#define Ye(a) cout<<((a)?"Yes":"No")<<endl;
#define YE(a) cout<<((a)?"YES":"NO")<<endl;
#define Vcin(a) rep(i,a.size())cin>>a[i];
#define println(n) cout<<n<<endl
#define printsp(n) cout<<n<<" "
#define print(n) cout<<n
#define pb push_back
#define mp make_pair
#define fi first
#define se second
#define vec vector
using namespace std;
using ll=long long;
using ull=unsigned long long;
vector<int>dx={0,1,0,-1,-1,-1,1,1};
vector<int>dy={1,0,-1,0,-1,1,-1,1};
int INF=1e9;
ll LINF=1e18;
int main(){
    int N;
    long double R;
    cin>>N>>R;
    long double ans=100,temp=100;
    rep(i,N-1){
        temp*=(1-R);
        ans+=temp;
    }
    cout << fixed << setprecision(20);
    println(ans);
}