// editor3

#include<stdio.h>
#include<ctype.h>

typedef struct cart
{
    char name[20];
    int id;
    float price;
}crt;

int main()
{
    int n;
    scanf("%d",&n);
    if(n<=0)
    {
        printf("Invalid input");
        return 0;
    }
    crt arr[n];
    float sum=0;
    for(int i=0;i<n;i++)
    {
        scanf("%s %d %f",arr[i].name,&arr[i].id,&arr[i].price);
        for(int j=0;arr[i].name[j]!='\0';j++);
        {
            if(!isalnum(arr[i].name[j]))
            {
                printf("Invalid input");
                return 0;
            }
        }
        sum+=arr[i].price;
    }
    printf("%.2f",sum);
}