package javaapplication42;
import java.util.*;




public class JavaApplication42 {


  public static void main(String[] args) {

    Scanner sc = new Scanner(System.in);
    while (sc.hasNext()){
      int n =sc.nextInt();
      int x=0;
      if(n>=40){
        x=100;
      }else if(n>20 ){
        x=80 + (n-20);
      }else if(n>10){
        x = 60 + 2*(n-10);
      }else{
        x = n *6;
      }
      System.out.println(x);


    }//while input end
  }
}