#include<stdio.h>
#include<ctype.h>
typedef struct product{
    char pname[50];
    int id;
    float price;
}pr;
int main(){
    int n;
    float sum;
    scanf("%d",&n);
   if(n<0){
       printf("Invalid input");
       return 0;
   }
   pr arr[n];
   for (int i=0;i<n;i++){
       scanf("%s\n%d\n%f\n",arr[i].pname,&arr[i].id,&arr[i].price);
       for (int j=0;arr[i].pname[J]!="\O";j++){
           if(!isalnum(arr[i].pname)){
               printf("Invalid input");
               return 0;
           }
       }
       sum+=arr[i].price;
   }
  
   printf("%.2f",sum);
}