Do while sentinel

Hi
How do I add a sentinel using a do while loop here so that when I enter -500 the program will close.

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#include <iostream>
#include <iomanip>
#include <cmath>

using namespace std;

int main()
{
	int integer, freq_pos = 0, freq_neg = 0, freq_zero = 0, sum_pos = 0, sum_neg = 0, total = 0, min = 0, max, x, y;
	

	for (x = 0; x < 8; x++)
	{
	cout << "Please enter an integer" << endl;
	cin >> integer;
	
	if (integer < min)
	{
		min = integer;
	}
	else if(integer == 0)
	{
		freq_zero = freq_zero + 1;
		sum_pos = sum_pos + integer;
	}
	else if (integer < 0)
		{
			freq_neg = freq_neg + 1;
			sum_neg = sum_neg + integer;
		}
	
	else if (integer > 0)
		{
			freq_pos = freq_pos + 1;
			sum_pos = sum_pos + integer;
	    } 
	}
    
    cout << "There are " << freq_pos << " positive numbers, " << freq_neg << " negative numbers and " << freq_zero << " zeroes" << endl;
	cout << "The lowest number is " << min << endl;
	cout << "The sum of all positive values is " << sum_pos << endl;
	cout << "The sum of all negative values is " << sum_neg << endl;
   return 0;
}
   
  
 

	
	
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#include <iostream>

auto constexpr sentinel = -500;

int main()
{
   int input{};
   do
    {

        std::cout << "Insert an element \n";
        std::cin >> input;//suggest input validation
        if(input != sentinel)
        {
            std::cout << input << "\n";
        }
    } while (input != sentinel);
}
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#include <iostream>

int main()
{
    const int sentinel = -500 ;
    int integer = 0 ;

    while( std::cout << "Please enter an integer: " && // display a prompt
           std::cin >> integer && // and if an integer was successfully read in
           integer != sentinel ) // and the integer is not the sentinel
    {
        // process the integer
    }
}
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