#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, &Order[i].productID, &Order[i].price);
        if(!isvalidname(Order[i].productName)){
            printf("Invalid input\n");
            return 0;
        }
        total += Order[i].price;
    }
    printf("%.2f\n",total);
    return 0;
}