#include <stdio.h>
typedef struct Cart{
    char product[10];
    int id;
    float price;
}a;
int main(){
    int n;
    float total;
    scanf("%d",&n);
    if(n<0){
        printf("Invalid input");
        return 0;
    }
    a arr[n];
    for(int i=0;i<n;i++){
        scanf("%s%d%f",arr[i].product,&arr[i].id,&arr[i].price);
        char str[20];
        int len;
        strcpy(str,arr[i].product);
        for(len=0;str[len];len++);
        for(int i=0;i<len;i++){
            if(!((str[i]>=65&&str[i]<=90)||(str[i]>=97&&str[i]<=122))){
                printf("Invalid input");
                return 0;
            }
        }
        
        total+=arr[i].price;
    }
    printf("%.2f",total);
    return 0;
    
}