#include<iostream>
using namespace std;
unsigned short in;
main(){
while(cin>>in){
if(in<=10)
cout<<in*6<<endl;
else if(in>=10&&in<=20)
cout<<60+(in-10)*2<<endl;
else if(in>=20&&in<=40)
cout<<80+(in-20)<<endl;
else
cout<<100<<endl;
}
}