Array counting loop not working

[wordman]

I'm having a problem with the sum counting the data being pulled in from my inputfile. I can display the input file correctly but the sum it not counting right. I have a input file with about 5 rows and 3 columns of data. I need sum to count the second column only. Can anyone help me?

#include <fstream>
#include <iostream>

using namespace std;

int main()
{
	ifstream fin;

	const int MAX_GRADES = 12;
	int number[MAX_GRADES];
	int maxpoints[MAX_GRADES];
	int earned[MAX_GRADES];

	int i = 0;
	int j = 0;
	int k = 0;
	int l = 0;
	int o = 0;
	int sum = 0;
	int sum1 = 0;

	fin.open("quizinfo.txt");

	if(!fin)
	{
		cout<< "Input Failed To Open.";
		return 1;
	}

	for(i = 0; i < 12; i++)
	{
		sum += number[i];
		fin>> number[i] >> maxpoints[i] >> earned[i];
	}

	for(j = 0; j < 6; j++)
	{
		cout<< number[k] << " " << maxpoints[l] << " " <<earned[o] << endl;

		k++;
		l++;
		o++;
	}

	cout<< endl << sum;

	return 0;
}