#include<stdio.h>
#define HOURS_PER_MONTH 160
union{
    int full_time_salary;
    float part_time_rate;
}salaryData;

struct{
    char name[101];
    int id;
    int type;
}emp;
int main(){
    int n;
    if(scanf("%d",&n)!=1){
        return 0;
    }
    if(n<0){
        printf("-1");
        return 0;
    }
    double total=0.0;
    
    for(int i=0;i<n;i++){
        scanf("%s",&emp=name);
        scanf("%d %d",&emp id,&emp type);
        
        if(emptype==1){
            scanf("%d",&emp=full_time_salary);
        }
        else if(emp.type==2){
            scanf("%f",&emp=part_time_rate);
        }
    }
    printf("%.2f",total);
}