#include <iostream>

using namespace std;
int main(){
  int n;
  cin >> n;
  if(n <= 10){
    cout << n * 6 << endl;
  }else if((n > 10) && (n <= 20)){
    cout << (n - 10) * 2 + 60 << endl;
  }else if((n > 20) && (n <= 40)){
      cout << (n - 20) + 80 << endl;
  }else{
    cout << "100" <<endl;
  }

}