// editor3
#include <stdio.h>
#include <ctype.h>
struct product{
    char name[30];
    int id; 
    float price;
};
int main(){
    int n;
    scanf("%d",&n);
    if(n<0){
        printf("Invalid input");
        return 0;
    }
    struct product arr[n];
    float sum=0;
    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'\n'
        if(!isalnum(arr[i].name[i])){
            printf("Inalid input");
            return 0;
        }
        
    }
    sum+=arr[i].price;
    }
    printf("%.2f",sum);
}