#include <stdio.h>
#include <iostream>
#include <sstream>
int main() {unsigned long long d;
scanf("%ld", &d);
unsigned long long f = d*108;
std::stringstream ss; ss<<f;
std::string s1; ss >> s1;
std::cout << s1.substr(0, s1.size()-2) << "." << s1.substr(s1.size()-2) << std::endl;
return 0;
}