#include<stdio.h>
#include<string.h>
#include<ctype.h>
struct Order
{
    char name[50];
    int id;
    float price;
};
int valid(char s[])
{
    for(int i=0;s[i];i++)
    if(!isalpha(s[i]) && s[i] !=' ') return 0;
    return 1;
}
int main()
{
    int n;
    scanf("%d",&n);
    if(n<=0) return printf("Invalid input"),0;
    for(int i=0;i<n;i++)
    {
        scanf("%s %d %f", o[i],name, &o[i].id, &o[i].price);
        if(!valid(o[i].name)) return printf("Invalid input"),0;
        total += o[i].price;
    }
    printf("%.2f",total);
}