#include <iostream.h>
#include <conio.h>

void main(void)
{
  int i;
  int sum;
  int count;

  sum = 0;

  cout << "Sum up to what number: ";
  cin >> count;

  if(count < 1) {
    cout << "Count must be positive\n";
    return;
  }

  for(i = 1; i <= count; i++) {
    sum += i;
  }

  cout << "Sum = " << sum << "\n";

  cout << "Enter any key to exit\n";
  getch();
}