#include <bits/stdc++.h> using namespace std; int main(){ ios_base::sync_with_stdio(false); cin.tie(nullptr); int N; cin >> N; double R; cin >> R; double answer = 0,now = 100; for(int i=0; i<N; i++){ answer += now; now *= (1.0-R); } cout << setprecision(16) << answer << endl; }