#include<stdio.h>
union Salary{
    int full_time_salary;
    float hourly_rate;
};
struct Employee{
    char name[50];
    int id;
    int type;
    union Salary sal;
};
int main(){
    int n;
    scanf("%d",&n);
    if(n<0){
        printf("-1");
        return 0;
    }
    struct Employee e[100];
    float total = 0;
    for(int i = 0;i<n;i++){
        scanf("%s %d %d",e[i].name, &e[i].id, &e[i].type);
        if(e[i].type == 1){
            scanf("%d",&e[i].sal.full_time_salary);
            total+=e[i].sal.full_time-salary;
        }
        else{
            scanf("%f",&e[i].sal.hourly_rate);
            total+= e[i].sal.hourly_rate*20;
        }
    }
    printf("%.2f",total);
    return 0;
}