int led1 =13;
int led2 =12;
int led3 =11;
int led4 =10;
int btn = 8;
int pot = A0;

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

}

void loop() {
  // put your main code here, to run repeatedly:
  int btnValue = digitalRead(btn);
  int potValue = analogRead(pot);
  int potValueMap = map(potValue, 0, 1023, 1, 4);
  if (btnValue == 1 & potValueMap ==1){
    digitalWrite(led1, HIGH);
}
if (btnValue == 1 & potValueMap ==2){
    digitalWrite(led2, HIGH);
}
if (btnValue == 1 & potValueMap ==3){
    digitalWrite(led3, HIGH);
}
if (btnValue == 1 & potValueMap ==4){
    digitalWrite(led4, HIGH);
}
if(btnValue == 0){
  digitalWrite(led1,LOW);
  digitalWrite(led2,LOW);
  digitalWrite(led3,LOW);
  digitalWrite(led4,LOW);
}
}