#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,&order[i].productID,&orders[i].price);
            
            if(!isValidName(orders[i].productName)){
                printf("Invalid input");
                return 0;
            }
            total += orders[1],price;
        }
        printf("%.2f",total);
        return 0;
    }