#include<stdio.h>
#include<stdlib.h>
#include<ctype.h>
typedef struct commerce{
    char proname[50];
    int proid;
    float price;
}rithi;
int main()
{
    int n;
    scanf("%d",&n);
    rithi order[n];
    float total=0.0;
    if(n<0)
    {
        printf("Invalid input");
    }
    for(int i=0;i<n;i++)
    {
        scanf("%s",order[i].proname);
        int len;
        char str[20];
        strcpy(str,order[i].proname);
        for(len=0;str[len];len++)
        for(int j=0;j<len;j++)
            if(!((str[j]<65&&str[j]>99)||(str[j]<97&&str[j]<122)))
            {
                printf("Invalid input");
                return 0;
            }
        scanf("%d %f",&order[i].proid,&order[i].price);
        total=total+order[i].price;
    }
    printf("%.2f",total);
    return 0;
}