算法训练 P1101

class prut {
   String MC;
   double DJ;
   int SL;
   public prut(String MC,double DJ,int SL){
       this.MC=MC;
       this.DJ=DJ;
       this.SL=SL;
              
   }

}

import java.util.Scanner;
public class Main {

    public static void main(String[] args) {
        // TODO Auto-generated method stub
        Scanner sc=new Scanner(System.in);
        while(sc.hasNext()){
        int n=sc.nextInt();
        prut[] pr=new prut[n+1];
            for(int i=0;i<n;i++){
                String t1=sc.next();
                double t2=sc.nextDouble();
                int t3=sc.nextInt();
                pr[i]=new prut(t1,t2,t3);
            }
            double ans=0.0;
            for(int i=0;i<n;i++){
                ans+=pr[i].DJ*pr[i].SL;
            }
            System.out.printf("%.6f",ans);
        }
        sc.close();

    }

}