#include<bits/stdc++.h>
using namespace std;

#define rep(i,n) for(int i=0;i<(n);i++)
#define REP(i,a,b) for(int i=(a);i<(b);i++)
#define pb push_back
#define all(v) (v).begin(),(v).end()
typedef vector<int>vi;

int main(){
    int N;
    cin>>N;
    double u=(1000000-N*100)*0.01;
    double d=N*100*0.99+(1000000-N*100)*0.01;

    printf("%.20lf\n",u/d*100);
    return 0;
}