#include <iostream> #include <vector> #include <cstdio> #include <sstream> #include <map> #include <string> #include <algorithm> #include <queue> #include <cmath> #include <set> using namespace std; int main(){ long long d; cin >> d; long long ans; ans = d*100 + d*8; char hoge[100]; sprintf(hoge,"%lld", ans); string hage(hoge); cout << hage.substr(0, hage.size()-2) << "." << hage.substr(hage.size()-2) << endl; return 0; }