#include<iostream>
#include<vector>
#include<algorithm>
#include<cstring>
#include<cassert>
#include<cmath>
#include<ctime>
#include<iomanip>
#include<numeric>
#include<stack>
#include<queue>
#include<map>
#include<unordered_map>
#include<set>
#include<unordered_set>
#include<bitset>
#include<random>
#include<functional>
#include<utility>
using namespace std;
void solve();
int main()
{
	ios::sync_with_stdio(false);
	cin.tie(nullptr);
	int tt = 1;
	//cin >> tt;
	while(tt--) solve();
}
void solve()
{
	//x(1+(1-R)+(1-R)^2+..+(1-R)^N-1) = x * (1-(1-R)^N)/R
	int N;
	long double R;
	cin >> N >> R;
	long double r = 1;
	for(int i = 0;i < N;i++) r *= 1-R;
	cout << fixed << setprecision(16);
	cout << 100*(1-r)/R << endl; 
}