Prompt input until a mimimum number of values is entered

I am writing a small program in which I have to search for smallest and largest element entered.

The thing is I have made an array 10 elements wide and the user should enter at least 5 element.

If the user enter less than 5 elements I want to prompt insufficient elements.

This is the code I have written but it's not working:

#include <iostream>
using namespace std;

int main()
{
    int arr[10], largest, smallest, i = 1, j = 1;
    cout << "Enter the values in array at least 5 and maximum 10 " << endl;
    for (int i = 0; i < 10; i++)
    {
        cin >> arr[i];
    }

    while (arr[i] >= 5)
    {
        largest = arr[0];
        smallest = arr[0];

        if (largest <= arr[j])
        {
            largest = arr[j];
        }

        if (smallest > arr[j])
        {
            smallest = arr[j];
        }

        j++;
        i++;
    }
    getch();
    return 0;
}