#include<iostream> #include<cstdio> using namespace std; int main() { int a,b = 6,c = 1.8,d = 2.7; double t; cin>>a; if (a<= 2){ t=6; cout<<t; } if (a>2 && a<=10){ t=6+(a-2)*c; cout<<t; } if(a>10){ t = 6+(10-2)*1.8+(a-10)*2.7; cout<<t; } return 0; }