#include<stdio.h>
#include<string.h>
#include<ctype.h>
struct order { char 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){
    printf("Invalid input\n");
    return 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)){
        printf("Invalid input\n");
    return 0;
        }
        total+=o[i].price;
    }
    printf("%.2f",total);
}