#include <bits/stdc++.h>
#define FOR(i,a,b) for(int i=(a);i<(b);i++)
#define REP(i,b)  FOR(i,0,b)
#define X real()
#define Y imag()
#define S second;
#define F first;
#define PB(a) push_back(a)
#define BE(c) c.begin(),c.end()
using namespace std;
typedef long long LL;
typedef pair<int,int> pr;
typedef pair<pr,int> ppr;
typedef priority_queue<pr,vector<pr>,greater<pr> > PQ;
typedef vector<pr> Vpr;
typedef vector<LL> VI;
typedef complex<LL> cld;
typedef vector<cld> Vcld;
const int SIZE=1000010;
const LL INF=1<<30;
int main(){	
	long double bad,good;
	long double N;
	cin >> N;
	bad=N/10000;
	good=1-bad;
	bad*=0.99;
	good*=0.01;
	printf("%.10f\n",double(100.0*(good)/(bad+good)));
	return 0;
}