#include<stdio.h>
#include<ctype.h>
#include<string.h>
struct Order{
    char productName[51];
    int productID;
    float price;
};
int isValidName(char name[]){
    for(int i=0;name[i]!='\0';i++){
        if(!isalnum(name[i])){
        }
    }
    return 1;
}
int main(){
    int n;
    scanf("%d",&n);
    if(n<0){
        printf("Invalid input\n");
        return 0;
    }
    struct Order orders[10];
    float total=0;
    for(int i=0;i<n;i++){
        scanf("%s %s %f",order[i].productName,&orders[i].productID,&orders[i].price);
        if(!isValidName(orders[i].productName)){
            printf("Invalid input\n");
            return 0;
        }
        total+=orders[i].price;
    }
    printf("%.2f\n",total);
    return 0;
}