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

union Salary {
    int full_time_salary;
    float part_time_rate;
};

struct Employee {
    char name[50];
    int id;
    int type; // 1 for full-time, 2 for part-time
    union Salary salary;
};

int main() {
    int n;
    scanf("%d", &n);

    if (n < 0) {
        printf("-1);
        return 0;
    }

    struct Employee emp[n];
    float total_salary = 0;

    for (int i = 0; i < n; i++) {
        scanf("%s %d %d", emp[i].name, &emp[i].id, &emp[i].type);

        if (emp[i].type == 1) {
            scanf("%d", &emp[i].salary.full_time_salary);
            total_salary += emp[i].salary.full_time_salary;
        } else if (emp[i].type == 2) {
            scanf("%f", &emp[i].salary.part_time_rate);
            total_salary += emp[i].salary.part_time_rate;
        }
    }

    printf("%.2f\n", total_salary);
    return 0;
}