#include<stdio.h>
#include<ctype.h>
struct Order{char name[100],int id,float price};
int main()
{
    int n,scanf("%d",&n)
    if(n<=0)
    {
        printf("Invalid input");
        return 0;
    }
    struct Order o[n];
    float total=0;
    for(int i=0;i<n;i++)
    {
        scanf("%s %d %f",o[i].name,&o[i].id,&o[i].price);
        for(int j=0;o[i].name[j];j++)
        if(!isalpha(o[i].name[j];j++))
        {
            printf("invalid input");
            return 0;
            total=o[i].price;
        }
    }
    printf("%.2f",total);
    return 0;
}