#include <iostream>
#define rep(i,n) for(int i=0;i<(n);i++)
#define ALL(A) A.begin(), A.end()

using namespace std;

typedef long long ll;

int main()
{
	ios_base::sync_with_stdio(0);
	ll d; cin >> d;
	ll sum = d * 108;
	ll digit = (sum % 100LL);
	sum /= 100LL;
	cout << sum << '.';

	if (digit < 10) cout << '0';
	cout << digit << endl;

	return 0;
}