#include<stdio.h>
#include<string.h>
#include<ctype.h>
struct order{
    char productName;
    int productID;
    float price;
};
int isValidName(char name[]){
    for(int i=0;name[i]!='\0';i++){
        if(!isalpha(name[i])){
            return 0;
        }
    }
    return 1;
}
int main(){
    int n;
    scanf("%d",&n);
    if(n<0){
        printf("Invalid input");
        return 0;
    }
    struct order orders[n];
    float total=0.0;
    for(int i=0;i<n;i++){
        scanf("%s %d %f",orders[i].productName, &orders[i].productID, &orders[i].price);
        if(!isValidName(orders[i].productName)){
            printf("Invalid input");
            return 0;
        }
    total+=orders[i].price;
    }
    printf("%.2f",total);
    return 0;
}