#include<stdio.h>
#include<ctype.h>
struct order{
    char name[100];
    int id;
    float price;}
int main(){
    int n; scanf("%d",&n);
    if(n<=0){
        printf("Invalid input");
        return 0;
    }
    struct Order o[n];
    float total=0;
    for(int i=0;i<n;i++){
        scanf("%s %d %f",0[i].name,&o[i].id,&0[i].price);
        for(int j=0;o[i].name[j];j++)
        if(!isalpha(o[i].name[j])){
            printf("Invalid input");
            return 0;
        }
        total+=o[i].price;
    }
    printf("%.2f",total);
    return 0;
}