#include <bits/stdc++.h>
#include <atcoder/all>
using namespace std;
using namespace atcoder;
#define ll long long
#define rep(i,n) for (int i = 0; i < (n); i++)
#define coutf(f) cout << fixed << setprecision(f)
#define all(v) (v).begin(), (v).end()
#define rall(v) (v).rbegin(), (v).rend()

int main() {
	ll d;
	cin >> d;
	d *= 108;
	double ans;
	string s = to_string(d);
	int n = s.size();
	rep(i, n - 2) cout << s[i];
	cout << "." << s[n - 2] << s[n - 1] << endl;
	return 0;
}