import java.util.Scanner;

abstract class Express{
    private int weight;
    public Express(int weight){
        this.weight = weight;
    }
    public int getWeight(){
        return weight;
    }
    abstract public int getTotal();
}

class SLExpress extends Express{

    public SLExpress(int weight){
        super(weight);
    }

    public int getTotal(){
        int weight = getWeight();
        if(weight<=1) return 12;
        else return 12+(weight-1)*2;
    }
}

class DDExpress extends Express{
    public DDExpress(int weight){
        super(weight);
    }

    public int getTotal(){
        int weight = getWeight();
        if(weight<=1) return 5;
        else return 5+(weight-1);
    }
}

public class Main{
    public static void main(String[] args){
        Scanner sc = new Scanner(System.in);

        int n = sc.nextInt();
        Express express; ////重点在这里！！！！！！！！

        int total = 0;//定义总价

        for (int i = 0; i < n; i++) {
            String a = sc.next();
            int b = sc.nextInt();
            if(a.equals("SL")){
                express = new SLExpress(b);  ///重点！！！！
                total+=express.getTotal();
            }

            if(a.equals("DD")){
                express = new DDExpress(b);  ///重点！！！！！
                total+=express.getTotal();
            }


        }
        System.out.println(total);
    }
}

不能用
SLExpress express = new SLExpress(b);
DDExpress express = new DDExpress(b);
来写