#include<stdio.h>
typedef struct prodeuct{
    char name[20];
    int id;
    float price;
}shalu;
int main()
{
    int size,ind;
    scanf("%d",&size);
    if(size<0)
    {
        printf("Invalid input");
        return0;
    }
    shalu stud[n];
    for(ind=0;ind<size;ind++)
    {
        scanf("%s",stud[ind].name);
        scanf("%d",&stud[ind].id);
        scanf("%f",&stud[ind].price);
    }
    total=stud[0].price+stud[1].price+stud[2].price;
    printf("%.2f",total);
    return 0;
}