/#include<stdio.h>
#include<type.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 0[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);
}