#include<stdio.h>
#include<ctype.h>
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];
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'\0';j++){
        if(!isalnum(arr[i].name[j])){
            printf("Invalid input");
            return 0;
        }
    }
sum+=arr[i].price;
}
printf("%.2f",sum);
}