#include<iostream>

using namespace std;
unsigned short in;

main(){

while(cin>>in){

if(in<=10)

cout<<in*6<<endl;

 if(in>=10&&in<=20)

cout<<60+(in-10)*2<

<endl;else if(in>=20&&in<=40

cout<<80+(in-20)<<endl;

els

cout<<100<<endl;
}
}