#include<iostream> #include<iomanip> using namespace std; int main() { int x = 0; cin >> x; if (x <= 2) { cout << 6; } if (x > 2 && x <= 10) { cout << (x - 2)*1.8 + 6; } if (x > 10) { cout << 6 + 8* 1.8 + (x-10) * 2.7; } }