#41351: 有if不用的叛逆小孩
#include<iostream>
using namespace std;
int main(){
int x;
cin>>x;
cout<<(x*6)-(x>10)*((x-10)*4)-(x>20)*((x-20)*1)-(x>40)*(x-40);
}
#include<iostream>
using namespace std;
int main(){
int x;
cin>>x;
cout<<(x*6)-(x>10)*((x-10)*4)-(x>20)*((x-20)*1)-(x>40)*(x-40);
}