#include<stdio.h>
#include<string.h>
typedef struct Ecommerce
{
    char productname[20];
    int id;
    float price;
}minion;
int main()
{
    int size,ind;
    scanf("%d",&size);
    if(size<0)
    {
        printf("Invalid input");
        return 0;
    }
    minion Ecommerce[size];
    for(int i=0;i<size;i++)
    {
        scanf("%s",Ecommerce[ind].productname);
        
        if(!(str[i]<65 && str[i]>90) || (str[i]<97 && str[i]>122)))
        {
            printf("Invalid input");
            return 0;
        }
        scanf("%d",&Ecommerce[ind].id);
        scanf("%f",&Ecommerce[ind].price);
        
    }
    
    
    
    
    float Total;
    Total=Ecommerce[0].price+Ecommerce[1].price+Ecommerce[2].price;
    printf("%.2f",Total);
    
    return 0;
}