int led1 = 8;
int led2 = 7;
int led3 = 6;
int led4 = 5;
int pot = A0;
int btn = 13;
 int i = 0;
void setup() {
  // put your setup code here, to run once:
  pinMode(led1, OUTPUT);
  pinMode(led2, OUTPUT);
  pinMode(led3, OUTPUT);
  pinMode(led4, OUTPUT);
  pinMode(pot, INPUT);
  pinMode(btn, INPUT);

  Serial.begin(9600);
}

void loop() {
  
  int btnValue = digitalRead(btn);
  int potValue = analogRead(pot);
  int potValueMap = map(potValue, 0, 1023, 1, 4);
  if(btnValue == 1 & potValueMap == 1)
  
 Serial.println(btnValue);
if (btnValue == 1){
 i++;
delay(500);

  if (i == 1){
    digitalWrite(led1, HIGH);
    
  }

  else if (i==2){
    digitalWrite(led2, HIGH);
  }

  else if (i == 3){
    digitalWrite(led3, HIGH);
  }
  else if (i == 4){
    digitalWrite(led4, HIGH);
  }

  else if (i==5){
    i = 0;
  }

  if ( i == 0){
    delay(200);
    digitalWrite(led1, LOW);
    digitalWrite(led3, LOW);
    digitalWrite(led2, LOW);
    digitalWrite(led4, LOW);
  }
 }

 
}