#include <iostream>
using namespace std;

int main() {
int x;
cin>>x;
if(x<11) cout <<(x*6);
else if(x>9,x<21)cout<<(10*6+(x-10)*2);
else if(x>20,x<40)cout<<(10*6+10*2+(x-20));
else cout <<"100";
}