#include<stdio.h>
struct cart{
    char name[20];
    int id;
    float price;
};
int main(){
    int size ,ind;
    float total;
    scanf("%d",&size);
    if(size<0){
        printf("Invalid input");
        return 0;
    }
    struct cart c1[size];
    for(ind=0;ind<size;ind++){
        scanf("%s",c1[ind].name);
        char str[20];
        int str[len];
        strcpy(str,c1[ind].name);
        for(len=0;str[len];len++);
        for(int i=0;i<len;i++){
            if(!((str[i]>=65&&str[i]<=90) ||str[i]>=97&&str[i]<=122)){
                printf("Invalid input");
                return 0;
            }
        }
        scanf("%d",&c1[ind].id);
        scanf("%f",&c1[ind].price);
    }
    for(ind=0;ind<size;ind++)
    total+=c1[ind].price;
    printf("%f",total);
    return 0;
}