#include<stdio.h>

typedef struct product{
    char name[30];
    int id;
    float price;
}reno;

int main(){
    int n,itr;
    float amount=0;
    if(!scanf("%d",&n)){
        printf("Invalid input");
        return 0;
    }
    if(n<0 || n>10){
        printf("Invalid input");
        return 0;
    }
    reno cart[n];
    for(itr=0;itr<n;itr++){
        scanf("%s",cart[itr].name);
        char str[30];
        int len,i;
        strcpy(str,car[itr].name);
        for(len=0;len<str[len];len++);
        for(i=0;i<len;i++){
            if(!((str[i]>=65 && str[i]<=90) || (str[i]>=97 && str[i]<=122))){
                printf("Invalid input");
                return 0;
            }
            
        }
        scanf("%d",&cart[itr].id);
        scanf("%.2f",&cart[itr].price);
        amount = amount + cart[itr].price;
    }
    printf("%.2f",amount);
    return0;
}