int result = 0;
int num1, num2, num3, num4;
cout << "Please Type 5 Numbers In A Row\n";
cout << "Only Even Numbers Smaller Than 20 Will Be Counted\n";
cin >> num1 >> num2 >> num3 >> num4;

/*
  Test Case 1
  Numbers => 15, 16, 22, 8
  Result => 24

  "Explain"
  Starting Result Is 0
  [Number 1] 15 => Not Even Number
  [Number 2] 16 => Smaller Than 20 And Even Number
  0 + 16 = 16
  [Number 3] 22 => Not Smaller Than 20
  [Number 4] 8  => Smaller Than 20 And Even Number
  16 + 8 = 24

  =================================

  Test Case 2
  Numbers => 100, 11, 12, 18
  Result => 30

  "Explain"
  Starting Result Is 0
  [Number 1] 100 => Not Smaller Than 20
  [Number 2] 11  => Not Even Number
  [Number 3] 12  => Smaller Than 20 And Even Number
  0 + 12 = 12
  [Number 4] 18  => Smaller Than 20 And Even Number
  12 + 18 = 30
*/