#include <stdio.h>
#include <atcoder/all>
#include <bits/stdc++.h>
using namespace std;
using namespace atcoder;
using mint = modint998244353;
#define rep(i,n) for (int i = 0; i < (n); ++i)
#define Inf32 1000000001
#define Inf64 4000000000000000001

int main(){
	
	int n;
	cin>>n;
	
	double R;
	cin>>R;
	double ans = 0;
	double cur = 100;
	rep(i,n){
		ans += cur;
		cur *= 1.0-R;
	}
	cout<<fixed<<setprecision(15)<<ans<<endl;
	
	return 0;
}