#include<stdio.h>
#include<stdlib.h>
#include<ctype.h>
#include<string.h>

struct Order{
    char product_name[100];
    int product_id;
    float price;
};

int validate_product_name(const char *name)
{
    for(int i=0;name[i];i++)
    {
        if(!isalnum(name[i]) && name[i]!='')
        {
            return 0;
        }
        return 1;
    }
}

int main()
{
    int n;
    scanf("%d",&n);
    
    if(n<0)
    {
        printf("Invalid input\n");
        return 0;
    }
    
    struct Order orders[n];
    float total_checkout=0.0;
    
    for(int i=0;i<n;i++)
    {
        scanf("%s %d %f",orders[i].product_name,&orders[i].product_id,&orders[i].price);
        
        if(!validate_product_name(orders[i].product_name))
        {
            printf("Invalid input\n");
            return 0;
        }
        
        total_checkout+=orders[i].price;
    }
    printf("%.2f\n",total_checkout);
    return 0;
}