#include <stdio.h>
 #include <string.h>
 #include <ctype.h>
 struct Order{
     char productName[50];
     int productID;
     float price;
 };
 int isValidName(char name[]){
     for (int i=0;name[i] !='\0';i++){
         if(!isalpha(name[i])){
             return 0;
         }
     }
     return 1;
 }
 int main(){
     int n;
     scanf("%d",&n);
     if(n<0){
         printf("Invalid input");
         return 0;
     }
     struct Order orders[n];
     float total=0.0;
     for(int  i=0;i<n;i++){
         scanf("%s %d",orders[i].productName,&orders[i].productID,&orders[i].price);
         if(!isValidName(orders[i].productName)){
             printf("Invalid input");
             return 0;
         }
         total += orders[i].price;
     }
     printf("%.2f",total);
     return 0;
 }