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

struct order { har name[50]; int id; float price; };

int valid(char s[]){
    for (int i=0;s[i];i++)
    if(!isalpha(s[i]) && s[i] != ' ')return 0;
    return 1;
}
int main(){
    int n;
    scanf("%d",&n);
    if(n<=0)return printf("Invalid input"), 0;
    struct ordero[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);
}