int led1 =13;
int led2 = 12;
int led3 = 8;
int led4 = 7;
int potpin = A0;

void setup() 
{
  // put your setup code here, to run once:
pinMode (potpin,INPUT);
pinMode (led1,OUTPUT);
pinMode (led2,OUTPUT);
pinMode (led3,OUTPUT);
pinMode (led4,OUTPUT);
Serial.begin(9600);
}

void loop() 
{
  // put your main code here, to run repeatedly:
int measure = analogRead(A0);
Serial.println(measure);
if (measure < 256)
{
digitalWrite(led1, HIGH);
digitalWrite(led2, LOW);
digitalWrite(led3, LOW);
digitalWrite(led4, LOW);

}else if (measure < 512)

{
digitalWrite(led1,HIGH);
digitalWrite(led2,HIGH);
digitalWrite(led3, LOW);
digitalWrite(led4, LOW);

}else if (measure < 768)

{
digitalWrite(led1,HIGH);
digitalWrite(led2,HIGH);
digitalWrite(led3, HIGH);
digitalWrite(led4, LOW);

}else if (measure < 1023)

{
digitalWrite(led1,HIGH);
digitalWrite(led2,HIGH);
digitalWrite(led3, HIGH);
digitalWrite(led4, HIGH);
}

}