#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) return printf("Invalid input"),0;
    struct Order o[n];float toatl =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);
}