#include <bits/stdc++.h> using namespace std; #define REP(i, n) for(int(i)=0;(i)<(n);++(i)) #define in(T,V) T V;cin>>V; int main(){ in(int,N); int T = 1000000; int M = N * 100; double N1 = (T-M)*0.01; double M1 = M*0.99; cout << setprecision(12) << N1/(N1+M1)*100 << endl; }