#include<stdio.h>
#include<ctype.h>
typedef struct product{
    char name[25];
    int id;
    float price;
};
int main(){
    int n;
    scanf("%d",&n);
   if(n<0){
        printf("Invalid input");
        return 0;
    }
    struct product arr[n];
    for(int 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'\0';j++){
            if(!isalnum(arr[i].name[j])){
                printf("Invalid input");
                return 0;
            }
        }
        sum+=arr[i].price;
     }
     printf("%.2f",sum);
}