#include<stdio.h>
struct cart
{
  char name[20];
  int id;
  float price;
};
int main()
{
    int size,ind;
    float total;
    scanf("%d",&size);
    if(size<0)
    {
        printf("Invalid input");
        return 0;

    }
    struct cart c1[size];
    for(ind=0;ind<size;ind++)
    {
        scanf("%s",c1[ind].name);
        char str[20];
        int len;
        strcpy(str,c1[ind].name);
        for(len=0;str[len];len++);
        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;
            }
        }
        scanf("%d",&c1[ind].id);
        scanf("%f",&c1[ind].price);
    }
    for(ind=0;ind<size;ind++)
    {
    total+=c1[ind].price;
    }
    printf("%.2f",total);
}