#include<stdio.h>
typedef struct Student{
    char proname[50];
    int proid;
    float price;
}rithi;
int main()
{
    int size,ind;
    scanf("%d",&size);
    if(size<0)
    {
        printf("Invalid input");
        return 0;
    }
    int len;
    scanf("%s",&proname);
    len=strlen(proname);
    strcpy(str,&proname);
    for(int i=0;i<len;i++)
    {
        if(!(str[i]))
    }
    rithi stud[size];
    for(ind=0;ind<size;ind++)
    {
        scanf("%s",stud[ind].proname);
        scanf("%d",&stud[ind].proid);
        scanf("%f",&stud[ind].price);
    }
    float total;
    total=stud[0].price+stud[1].price+stud[2].price;
    printf("%.2f",total);
}