Button with Motor

const int motor = 9;
const int button = 10;
int ReadValue;
int count = 0;
boolean currentButton;
boolean lastButton;
boolean flagOn;

void setup()
{
  pinMode (motor, OUTPUT);
  Serial.begin (9600);
}
boolean debounce (boolean last)
{
  boolean current = digitalRead (button);
  if (last != current)
  {
    delay (5);
    current = digitalRead (button);
  }
  return current;
}

void loop()
{
  currentButton = debounce (lastButton);
  if (lastButton == LOW && currentButton == HIGH)
  {
    count ++;
    Serial.println (count);
  }
  if (count == 0)
    {
    analogWrite (motor, 0);
    delay (50);
    }
  if (count == 1)
    {
    analogWrite (motor, 100);
    delay (50);
    }
  if (count == 2)
    {
    analogWrite (motor, 150);
    delay (50);
    }
  if (count == 3)
    {
    analogWrite (motor, 200);
    delay (50);
    }
   if (count == 4)
    {
    analogWrite (motor, 250);
    delay (50);
    }

  if (count == 5)
  {
  count =0;
  }
  lastButton = currentButton;
}