#include <cstdio>
#include <cstdlib>
#include <cstring>
#include <algorithm>
#include <iostream>
#include <map>
#include <vector>
#include <queue>
#include <set>

using namespace std;

//namaega184

int main(){
	
	int n;scanf("%d",&n);
	n*=100;
	double ans=1000000-n;
	printf("%f\n",ans*0.01/(ans*0.01+n*0.99)*100);
	 
	return 0;
}