#include <bits/stdc++.h>
#define rep(i,n) for(int i=0;i<(n);++i)
#define all(a) (a).begin(),(a).end()
#define dunk(a) cout << (a) << endl
using namespace std;
typedef long long ll;

int main() {
	ios::sync_with_stdio(false);
	cin.tie(0);
	ll d;
	cin >> d;
	int a = d % 100;
	a *= 8;
	a %= 100;
	cout << ll(d * 1.08);
	cout << '.';
	if (a < 10) cout << 0;
	cout << a << endl;
	
	return 0;
}