#include<stdio.h>
#include<ctype.h>

typedef struct Stuffs{
    char name[20];
    int id;
    float price;
}ran;

int main(){
    int i,size;
    float sum =0;
    scanf("%d",&size);
    if(size<0){
        printf("Invalid input");
        return 0;
    }
    ran prod[40];
    for(i=0;i<size;i++){
        (scanf("%s\n",prod[i].name);
        if(prod[i].name>=65 && prod[i].name<=90 || prod[i].name>=97 && prod[i].name<=122){
            printf("Invalid input");
            return 0;
        }
        /*if(!isalpha(prod[i].name) && !isdigit(prod[i].name)){
            printf("Invalid input");
            return 0;
        }*/
        scanf("%d\n",&prod[i].id);
        scanf("%f\n",&prod[i].price);
        sum += prod[i].price;
    }
    printf("%.2f",sum);
    return 0;
}