# include<iostream> # include<cmath> using namespace std; int main(){ int a,t; t=6; cin>>a; if(a<=2){ cout<<6; } if(a>2&&a<=10){ cout<<6+(a-2)*1.8; } if(b<c){ cout<<6+(a-2)*1.8+(a-10)*1.8*1.5; } return 0; }