void setup() {
 Serial.begin(9600);
 ADCSRA |= 1<<ADEN;
 ADCSRA |= 1<<ADPS0;
 ADCSRA |= 1<<ADPS1;
 ADCSRA |= 1<<ADPS2;

}

void loop() {
  ADCSRA |= 1<<ADSC;
  while((ADCSRA&(1<<ADIF)) == 0);
  int a = ADCL;
  a |=(ADCH<<8);
  Serial.println(a); 

}