const int INPUT_PIN = 2;  
const int CLOCK_PIN = 3; 
const int STORAGE_PIN = 4; 

byte globalCounter = 0;

void setup() {
  pinMode(INPUT_PIN, OUTPUT);
  pinMode(CLOCK_PIN, OUTPUT);
  pinMode(STORAGE_PIN, OUTPUT);
}

void loop() {
  digitalWrite(STORAGE_PIN, LOW);
  shiftOut(INPUT_PIN, CLOCK_PIN, MSBFIRST, globalCounter);
  digitalWrite(STORAGE_PIN, HIGH);
  globalCounter++;
  delay(100);
}