#include<stdio.h>
typedef struct node{
    char name[20];
    int id;
    float price;
}s2;
int main(){
    int size;
    float result=0;
    scanf("%d",&size);
    if(size<=0){
        printf("Invalid input");
    }
    s2 arr[size];
    for(int i=0;i<size;i++){
        scanf("%s",arr[i].name);
        int len;
        char str[20];
        strcpy(str,arr[i].name);
        for(int len = 0;str[len];len++){
            for(int j=0;j<len;j++){
                if(!((str[i]>=65 && str[i]>=90)||(str[i]>=97 &&str[i]>=122))){
                    printf("Invalid input");
                    return 0;
                }
            }
        }
        
        
        
        scanf("%d",&arr[i].id);
        scanf("%f",&arr[i].price);
        result=result+arr[i].price;
    }
    printf("%.2f",result);
    return 0;
}