#include<stdio.h>
typedef struct cus_det{
    char name[50];
    int id;
    float price;
}mk;
int main(){
    int n;
    scanf("%d",&n);
    if(n<0){
        printf("Inavlid input");
        return 0;
    }
    mk 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';j++){
            if(!isalnum(arr[i].name[j])){
                printf("Invalid inpur");
                return 0;
            }
            
        }
    }
    
    float sum = 0.0;
    for (int i = 0;i<n;i++){
        sum += arr[i].price;
        
    }
    prntf("%.2f",sum);
}