#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\n");
        return 0;
    }
    struct Order orders[10];
    float total = 0;
    for(int i = 0; i<n;i++){
        scanf("%s %d %f",orders[i].productName,&orders[i].productID,&orders[i].price);
        if(!isValidName(order[i].productName)) {
            printf("Invalid input\n");
            return 0;
        }
        total += orders[i].price;
    }
    printf("%.2f\n",total);
    return 0;
    }