#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;
    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);
        if(!Valid(o[i].name)) return
        printf("Invalid iput"),0;
        total += 0[i].price;
    }
    printf("%.2f",total);
}