#include<stdio.h>
#include<string.h>
#include<ctype.h>
struct Order{char,name[50];int id;float price;};
int valid(chars[]){
    for(int i=0;s[i];i++)
    if(!isalpha(s[i])&& s[i]!=' ')
    return 0;
    return 1;
    
}
int main(){
    scanf("%d",&n);
    if(n<=0) return printf("Invalid input"),0;
    struct Order o[n];float total=0;
    for(int i=0;i<n;i++){
        scanf("%s %d %f",o[i].name,&o[i].id,&o[i].price);
        if(!valid(o[i].name)) return printf("Invalid input"),0;
        total += o[i].price;
    }
    printf("%2f",total);
}