#include<stdio.h>
#include<ctype.h>
#include<string.h>
struct  Order{
    char productName[51];
    int productID;
    float price;
};
int isValidName(char name[])
{
    for(int i=0;name[i]!='\0';i++)
    {
        if(!isalnum(name[i]))
        {
            return 0;
        }
    }
    return 1;
}
int main()
{
    int n;
    scanf("%d",&n);
    if(n<0)
    {
        printf("Invalid input");
        return 0;
    }
    srtuct Order order[10];
    float tottal =0;
    for(int i=0;i<n;i++)
    {
        scanf("%s %d %f",Order[i].productName,&order[i].productID,&Order[i].price);
        if(!isValidName(order[i].productName))
        {
            printf("Invalid input");
            return 0;
        }
        total+=order[i].price;
    }
    printf("%.2f\n",total);
    return 0;
}