#include <stdio.h>
struct Order {
    char name[50];
    int id;
    float price;
};
int main() {
    int n;
    float total = 0;
    scanf("%d", &n);
    if (n < 0) {
        printf("Invalid input");
        return 0;
    }

    struct Order o;

    for (int i = 0; i < n; i++) {
        scanf("%s", o.name);
        scanf("%d", &o.id);
        scanf("%f", &o.price);
    for(int j=0;o.name[j]!='\0';j++){
        if(!isalnum(o.name[j])){
            printf("Invalid input");
            ret
        }
    }

        total = total + o.price;
    }

    printf("%.2f", total);

    return 0;
}