# include<iostream> using namespace std; int main(){ int s; float m; cin>>s; if(s<=2){ m=6*1.0; cout<<m; } else{ if(s>2 && s<=10){ m=6+(s-2)*1.8; cout<<m; } else{ m=6+(10-2)*1.8+(s-10)*(1.8*1.5); cout<<m; } } }