#include<stdio.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;
    }
    int len;
    scanf("%s",&productname);
    len=strlen(productname);
    strcpy(str,&productname);
    for(int i=0;i<len;i++)
    {
        if(!(str[i]<=65 && str[i]>=90 || str[i]<=97 && str[i]>=122))
        {
            printf("Invalid input");
            return 0;
        }
    }
    
    minion Ecommerce[size];
    for(ind=0;ind<size;ind++)
    {
        scanf("%s",Ecommerce[ind].productname);
        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;
}