import java.util.*;
public class hello{
    public static void main(String[]args){
        Scanner sc = new Scanner(System.in);
        if(n<0 || n>20){
            System.out.println("Invalid input");
        }
        int total=0;
        int n = sc.nextInt();
        for(int i=0;i<n;i++){
            String type = sc.next();
            int qty = sc.nextInt();
            int cal =sc.nextInt();
            if(!(type.equals("Fruit")||type.equals("Vegetable")||type.equals("Dairy"))){
                System.out.println("Invalid input");
                return;
            }
            else{
                
            }
            if(qty<0||cal<0){
                System.out.println("-1");
                return;
            }
            total+=qty*cal;
        }
        System.out.println(total);
    }
}