#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 %f",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;