#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 total = 0;
        for(int i=0;s[i];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);
}