#include <stdio.h>
#include <string.h>
#include <ctype.h>

struct Order {
    char name[50];
    int id;
    float price;
};
int valid(char s[]) {
    for (int i = 0; s[i]; i++){
        if (!isalpha(s[i]) && s[i] != ' ') 
            return 0;
    return 0;
}
int main()
{
    int n;
    scanf("%d", &n);
    if (n <= 0) {
        printf ("Invalid input");
        return 0;
    }
    struct Order o[n];
    float total = 0;
    for (int i = 0; i < n; i++)
    {
        scanf("%s %d %f", o[i].name, &o[i].id, &o[i].price);
        if (!valid(o[i].name)) return printf("Invalid input");
        total += o[i].price;
    }
    printf("%.2f", total);
    return 0;
}