// editor3
#include<stdio.h>
#include<string.h>
#include<ctype.h>

typedef struct Product{
    char name[20];
    int id;
    float price;
}P;
int valid_num(cons char *name){
    for(int i=0;name[i];i++){
        if(!isalnum(name[i])&&!isspace(name[i])) return 0;
    }
    return 1;
}
int main(){
    int n;
    scanf("%d",&n);
    if(n<0){
        printf("Invalid input");
        return 1;
    }
    P stud[n];
    float total=0;
    for(int ind=0;ind<n;ind++){
        if(scanf("%99s %d %f",stud[ind].name,&stud[i].id,&stud[ind].price !=3){
            printf("Invalid input\n");
            return 1;
        }
        if(!valid_num(stud[ind].name)){
            printf("Invalid input\n");
            return 1;
        }
        total += stud[ind].price
    }
    
    
    
}<0