#include<stdio.h>
#include<ctype.h>
struct order {
    char name[50];
    int id;
    float price;
};
int main() {
    int n;
    float total = 0.0;
    scanf("%d", &n);
    if (n < 0) {
        printf("Invalid input");
        return 0;
    }
    struct order o;
    for(int i =0; i < n; i++) {
        scanf("%s %d %f", o.name, &o.id, &o.price);
        for (int j =0; o.name[j] != '/0'; j++) {
            if (o.name[j] < 'A' ||
               (o.name[j]) > 'Z' && o.name[j] < 'a') ||
                o.name[j] > 'z') {
                   printf("Invalid input");
                   return 0;
               }
        }
        total += o.price;
    }
    printf("%.2f", total);
    return 0;
}