#include <stdio.h>
#include <algorithm>
#include <iostream>
#include <string>
#include <vector>
#include <functional>
#include <map>
#include <iomanip>
#include <math.h> 
#include <stack>
#include <queue>
#include <bitset>
#include <cstdlib>
#include <tuple>
#include <cctype>
#include <ctype.h>
#include <set>
#include <sstream>

using namespace std;

int main(){
	int i, j;
	double n;

	cin >> n;

	double num = n * 1.08;

	string s = to_string(num);

	for (i = 0; i < s.length(); i++) {
		if (s[i] == '.') {
			cout << s[i];
			for (j = i + 1; j < s.length() && j < i + 4; j++) {
				cout << s[j];
			}
			break;
		}
		cout << s[i];
	}
	cout << endl;




//	cout << fixed << setprecision(5)<< n * 1.08 << endl;











	getchar();
	getchar();
	return 0;
}