// editor3
#include<stdio.h>
#include<stdlib.h>

typedef struct order{
    char product[20];
    int id;
    float price;
}order;

int main(){
    int n;
    scanf("%d",&n);
    if(n<0){
        printf("Invalid input");
        return 0;
    }
    order pr1[n];
    for(int i=0;i<n;i++){
        scanf("%s\n",pr1[i].product);
        scanf("%d\n",&pr1[i].id);
        scanf("%f\n",&pr1[i].price);
        if(!isalpha(pr1[i].product)){
            printf("Invalid input");
            return 0;
        }
    }
    float checkout;
    for(int i=0;i<n;checkout+=pr1[i++].price);
    printf("%.2f",checkout);
    return 0;
}