#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 0;
            
        }
    }
    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 %d %f",orders[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);