#include<stdio.h>
#include<ctype.h>
struct product{
    char name[20];
    int id;
    float price;
    };
    int main(){
    int n,i;
    scanf("%d",&n);
    if(n<0){
    printf("Invalid input");
    return 0;
    }
    struct product arr[n];
    float total = 0;
    for(i=0;i<n;i++){
    scanf("%s %d %f",arr[i].name,&arr[i].id,&arr[i].price);
        for(int j=0;arr[i].name(j)!='\0';j++){
            if(!isalnum(arr[i].name[j])){
                printf("Invalid input");
                break;
            }
        } 
    total+=arr[i].price;
    }
    printf("%.2f",total);
}