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

signed main()
{
	ll input;
	
	cin >> input;
	double temp = (double)input * 1.08;
	double ans = (double)input * 1.08;
	//printf("%f\n", ans);
	
	cout << ans << endl;
	
	return 0;
}