#include<bits/stdc++.h>
using namespace std;
typedef pair<int,int>P;
typedef vector<int>VI;
#define rep(i,n) for(int i=0;i<(n);i++)
#define pb push_back
#define all(v) (v).begin(),(v).end()
#define maxv(a,b) (a)=max((a),(b))
#define int long long

signed main(){
    int a;
    cin>>a;

    a*=108;

    cout<<a/100<<"."<<a%100<<endl;
    return 0;
}